Pratt & Whitney Co. - Assigned Patents

Manufacturers Index - Pratt & Whitney Co.

Pratt & Whitney Co.
Hartford, CT, U.S.A.
Company Website: http://www.prattandwhitney.com/
Manufacturer Class: Wood Working Machinery & Metal Working Machinery

Patents

This page contains information on patents issued to this manufacturer.

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Patent Number	Date	Title	Name	City	Description
29,939	Sep. 04, 1860	Improvement in devices for stopping and changing motion	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
33,126	Aug. 20, 1861	Improvement in rotary pumps	Monroe Stannard	New Britain, CT
33,816	Nov. 26, 1861	Improvement in stopping and changing motion	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
36,479	Sep. 16, 1862	Tool-rest for turning-lathes	Francis A. Pratt	Hartford, CT
40,082	Sep. 22, 1863	Improvement in attaching pumps to bungs of barrels	Francis A. Pratt	Hartford, CT
40,276	Oct. 13, 1863	Improvement in apparatus for attaching pumps to bungs of barrels	Francis A. Pratt	Hartford, CT
46,152	Jan. 31, 1865	Improvement in turning-lathes	Dwight Slate	Hartford, Hartford County, CT	"My invention relates to that kind of turning-lathe in which the arrangement for turning tapering and curved forms consists in giving to the cutting-tool a motion in and out to and from the axis of the lathe-spindle, in combination with the feed-carriage."
60,418	Dec. 11, 1866	Improvement in sewing-machines	Francis A. Pratt	Hartford, CT	Of minor interest because the inventor was co-founder of Pratt & Whitney Co., a machine-tool maker.
RE2,588	Apr. 30, 1867	Improvement in device for stopping and changing motion	Francis A. Pratt	Hartford, CT	The inventor was co-founder of machine-tool maker Pratt & Whitney Co., and assignee was also known as Phoenix Iron Works, which made drill presses.
89,177	Apr. 20, 1869	Planing Metals	Dwight Slate	Hartford, Hartford County, CT	The nature of this invention will be understood from the specification and drawings, the object of which is to simplify and make more direct the action of the whole mechanism of the shipping-apparatus of a planer. It has heretofore been the most difficult part to arrange in a planer, involving many joints, rods, &c. By this arrangement, many parts heretofore used, are dispensed with, by substituting a rock-shaft, or a rolling, or oscillating cam, secured upon a rock-shaft, which carries or actuates the shipper-rod, thereby-rendering it more simple, efficient, and durable.
D3,611	Aug. 10, 1869	Design for an upright drill	Francis A. Pratt	Hartford, CT
93,903	Aug. 17, 1869	Metal Planing	Francis A. Pratt	Hartfotd, CT
100,064	Feb. 22, 1870	Improvement in friction-clutches	Francis A. Pratt	Hartford, CT
102,577	May. 03, 1870	Metal Chuck	Augustus Newell	Chicago, Cook County, IL	Munn & Co.- patent attorneys
		Metal Chuck	William Pim	Chicago, Cook County, IL
D4,439	Oct. 25, 1870	Design for a drilling-machine	Francis A. Pratt	Hartford, CT
112,379	Mar. 07, 1871	Improvement in machines for shaping and cutting gear-cutters	Francis A. Pratt	Hartford, CT
118,481	Aug. 29, 1871	Improvements in Machinery for Feeding Wire to Machines	Edward G. Parkhurst	Hartford, Hartford County, CT	This patent was improved upon by patent #714,895.
148,566	Mar. 17, 1874	Griping and Cutting Tools	De Lancy Kennedy	New York, NY	Compound leverage applied to nippers, shears, punches, etc. A known application of the principle was a metal cutting shears.
155,051	Sep. 15, 1874	Improvement in testing-machines	Robert H. Thurston	Hoboken, NJ	The inventor was professor of mechanical engineering in the Stevens Institute of Technology in Hoboken. An 1893 catalog from Pratt & Whitney shows an "Improved Autographic Torsion Testing Machine. Prof. R. H. Thurston's patents." The illustrated machine is labeled as made by Pratt & Whitney. The only other R. H. Thurston patent wee have found is patent 230,158, for a lubricant testing machine, which was also manufactured by Pratt & Whitney.
161,968	Apr. 13, 1875	Metal Punch	De Lancy Kennedy	New York, NY
164,391	Jun. 15, 1875	Improvement in metal-shearing machines	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
164,392	Jun. 15, 1875	Improvement in drop-hammers	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
165,519	Jul. 13, 1875	Protractor	Ambrose Swasey	Hartford, Hartford County, CT	Swasey's Bevel Protractor The accompanying illustration represents a new instrument intended for the use of draughtsmen, machinists and surveyors. It was invented by Ambrose Swasey, at the shops of the Pratt & Whitney Co., of Hartford, Conn. First, we have a plain steel square, one-eighth of an inch thick, the two sides of which are each five inches in length. A swinging rule, or blade A, is attached to the square by means of a circular piece B, which moves in a dovetailed slot, and may be set to move tight or loose by means of two screws and the binder C, depending upon the friction to hold it. The edge of the slot is marked with the different degrees, from zero up to 90Â°. In the illustration, each mark on the arc represents 5Â°, while in the regular instrument each of these degrees is marked. Both sides of the protractor presents a level face, so that it may lie flat upon the paper, and be used equally well on either side. The protractors in general use have a thumb-screw (to hold the blade), which projects from one side, in consequence of which only one side can be used. The Swasey instrument is so arranged that any angle may be measured or drawn, whether acute or obtuse. Should the draughtsman wish to draw a line at an angle of 65Â° from his T square, set the zero mark on the sliding arc to that number, as indicated by the graduations, and placing the base of the square forming that angle with the swinging rule against the T square; then draw the desired angle. By simply turning the instrument one-quarter turn, round towards the right, so as to bring the other base of the square against the T square, will give an angle of 155Â°. If the instrument be now lifted by the right-hand corner and turned over towards the left (upside down), the angle formed will be 25Â° Again, if the instrument be placed in the first position, as shown in drawing, the angle being 65Â°, taking hold of the left-hand corner and turning it over (upside down), will give an opposite angle of 115Â°. From the foregoing illustrations, the reader will understand that after drawing an angle of 60Â°, by turning the instrument over the same angle may be drawn but pointing in the opposite direction. The advantages of these problems may be readily understood by draughtsmen, as by simply turning the instrument, any angle, or its complement, may be drawn at once. This instrument is particularly adapted to the measurement of angles drawn upon paper or any other plane surface, as the swinging rule being the same thickness as the square, the edges of both lie even upon the paper, thus the protractor can be more accurately adjusted to the lines than if one edge were raised above the surface, as is the case with most protractors. Another practical advantage in having both sides of the protractor even is, when the angles of solid bodies are to be measured, as in the case of crystals, pieces of machinery, etc., there is no difficulty in holding it firmly and squarely upon the piece to be measured, at the same time forming the angle between the swinging rule and body of the tool, open to the apex. The cross-section lines of complicated parts of machinery, where a number of angles are required to bring out the different parts distinctly, may be readily drawn by adjusting the swinging rule. American Machinist, 24 Jan 1880, pg. 7
167,165	Aug. 31, 1875	Improvement in die-stocks	John J. Grant	Hartford, CT
168,412	Oct. 05, 1875	Improvement in cranes	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
168,349	Oct. 05, 1875	Improvement in screw-cutting dies	Jireh Case Sherman	New Bedford, MA
170,949	Dec. 14, 1875	Improvement in screw-cutting die holders	John J. Grant	Hartford, CT
172,854	Feb. 01, 1876	Wrench	John J. Grant	Hartford, CT	The gripping jaws are actuated by ratchet action. The inside of the ratchet wheel has "tapered" flanges which engage slots in the gripping jaws, to close or open them. A spring-loaded pawl on one side provides the ratchet action.
173,780	Feb. 22, 1876	Improvement in screw-cutting dies	John J. Grant	Hartford, CT
176,683	Apr. 25, 1876	Ratchet Drill	Joseph Renshaw	Hartford, Hartford County, CT
189,057	Apr. 03, 1877	Improvement in machines for varnishing the interior of cartridge-shells	Francis A. Pratt	Hartford, CT
		Improvement in machines for varnishing the interior of cartridge-shells	John R. Reynolds	Hartford, CT
204,028	May. 21, 1878	Improvement in screw-cutting dies	John J. Grant	Hartford, CT
		Improvement in screw-cutting dies	Nelson Sawyer	Hartford, CT
		Improvement in screw-cutting dies	Frederick N. Gardner	Hartford, CT
230,158	Jul. 20, 1880	Machine for testing lubricants	Robert H. Thurston	Hoboken, NJ	The inventor was professor of mechanical engineering in the Stevens Institute of Technology in Hoboken. An 1893 catalog from Pratt & Whitney shows an "Improved Standard Railroad Oil Testing Machine. Prof. R. H. Thurston's patents." The only other R. H. Thurston patent wee have found is patent 155,051, which relates to torsion testing; that machine was also manufactured by Pratt & Whitney.
231,607	Aug. 24, 1880	Machine-gun	Edward G. Parkhurst	Hartford, CT	See also patents 227,648, 228,777, and 235,627. This patent gives improvements to the "Gardner gun", an early machine gun originally developed by William Gardner of Toledo. Although trials of Pratt & Whitney's improved version were successful they were unable to interest the U.S. Army in purchasing any. The British Army, however did end up purchasing some.
241,236	May. 10, 1881	Adjustable lever	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
241,563	May. 17, 1881	Metal-planing machine	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
248,587	Oct. 25, 1881	Device for Throwing Belts Onto or Off From Revolving Pulleys	William Gray	Hartford, Hartford County, CT
256,165	Apr. 11, 1882	Machine for Cutting Grooves in Rolls	John R. Reynolds	Hartford, CT
259,040	Jun. 06, 1882	Ammunition-box	Edward G. Parkhurst	Hartford, CT
275,431	Apr. 10, 1883	Metal Screw Machine	Christopher M. Spencer	Hartford, Hartford County, CT	The Pratt & Whitney Co. made these machines for the Hartford Screw Machine Co.
290,612	Dec. 18, 1883	Knurling-tool	William W. Tucker	Hartford, CT
298,979	May. 20, 1884	Friction Clutch	Moses C. Johnson	Hartford, Hartford County, CT
303,321	Aug. 12, 1884	Friction Clutch	Francis H. Richards	Springfield, Hampden County, MA
305,234	Sep. 16, 1884	Gear Cutting Machine	Francis H. Richards	Springfield, Hampden County, MA
306,257	Oct. 07, 1884	Cutting Blade for Lathe Tools	Moses C. Johnson	Hartford, Hartford County, CT
319,618	Jun. 09, 1885	Frame and carriage for machines	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
319,650	Jun. 09, 1885	Lathe Head	Amos Whitney	Hartford, Hartford County, CT
323,202	Jul. 28, 1885	Milling-machine	Francis A. Pratt	Hartford, CT	Seen on an old Pratt & Whitney milling machine.
323,208	Jul. 28, 1885	Planer Table Driving Mechanism	Francis H. Richards	Springfield, MA
331,046	Nov. 24, 1885	Slide Rest	James Fitzgerald	Providence, Providence County, RI
331,443	Dec. 01, 1885	Blank-feeding mechanism	Francis H. Richards	Springfield, MA	The "blanks" in questions are pieces of paper to be fed into an envelope-making machine.
336,024	Feb. 09, 1886	Screw Threading Tool	George D. Tucker	Hartford, Hartford County, CT
349,840	Sep. 28, 1886	Drafting Compass	Frederick N. Gardner	Hartford, CT	Frederick N. Gardner was president of Hartford Tool Co., which was bought by Pratt & Whitney around 1886.
354,737	Dec. 21, 1886	Lathe Head	Francis H. Richards	Springfield, Hampden County, MA
365,744	Jun. 28, 1887	Drilling-machine	John Worth Heyer	Hartford, CT
366,187	Jul. 05, 1887	Shearing mechanism	Francis H. Richards	Springfield, MA
376,838	Jan. 24, 1888	Drilling Machine	Amos Whitney	Hartford, Hartford County, CT	This patent was improved on by patent #390,108.
385,543	Jul. 03, 1888	Tap with Detachable Cutters	Albert Burritt	Waterbury, New Haven County, CT
390,190	Sep. 25, 1888	Turret-lock	Francis H. Richards	Hartford, CT
390,108	Sep. 25, 1888	Center Drilling Machine	Amos Whitney	Hartford, Hartford County, CT	This patent was an improvement on patent #376,838.
402,510	Apr. 30, 1889	Valve Operating Mechcanism for Grain Scales	Charles H. Cooley	Hartford, Hartford County, CT
403,988	May. 28, 1889	Automatic Grain Scales	Charles H. Cooley	Hartford, CT	F. H. Richards - patent attorney My improved, machine comprises as principal elements thereof a scale-beam, a double chambered oscillating bucket suspended from one end of said beam, a counterpoise or weight supported from or on the opposite end of said beam, a supplemental weight, a discharging hopper above said bucket, a movable receiving-hopper below said bucket, a pair of cutoff valves and devices actuating the same from the scale-beam, and a regulator-valve operatively connected with the movable receiving-hopper. Not all of these elements, however, are necessarily employed in a single machine.
408,192	Jul. 30, 1889	Stop Motion Register for Grain Scales	Francis H. Richards	Hartford, Hartford County, CT
414,357	Nov. 05, 1889	Screw Cutting Tool	James E. Woodbridge	Hartford, Hartford County, CT	Application renewed 05 Oct., 1888.
421,556	Feb. 18, 1890	Automatic regulator for grain-scales	Charles H. Cooley	Hartford, CT	A companion patent to 403,988.
421,773	Feb. 18, 1890	Screw Cutting Die	Thomas L. Smith	Milwaukee, WI	Original Application filed on 30 Aug 1877. F. H. Richards - patent attorney
434,702	Aug. 19, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
		Grain-weigher	Francis H. Richards	Hartford, CT
434,723	Aug. 19, 1890	Regulator for Grain Weighers	Francis H. Richards	Hartford, Hartford County, CT
440,740	Nov. 18, 1890	Scale-beam for grain-weighers	Charles H. Cooley	Hartford, CT
		Scale-beam for grain-weighers	Francis H. Richards	Hartford, CT
442,640	Dec. 16, 1890	Regulator for grain-scales	Francis H. Richards	Hartford, CT
442,711	Dec. 16, 1890	Regulator for grain-scales	Francis H. Richards	Hartford, CT
442,712	Dec. 16, 1890	Grain-weigher	Francis H. Richards	Hartford, CT
442,713	Dec. 16, 1890	Grain-weigher	Francis H. Richards	Hartford, CT
442,714	Dec. 16, 1890	Grain-weigher	Francis H. Richards	Hartford, CT
442,715	Dec. 16, 1890	Regulator grain-weigher	Francis H. Richards	Hartford, CT
442,716	Dec. 16, 1890	Regulator grain-weigher	Francis H. Richards	Hartford, CT
442,717	Dec. 16, 1890	Grain-weigher	Francis H. Richards	Hartford, CT
442,718	Dec. 16, 1890	Grain-meter	Francis H. Richards	Hartford, CT
442,719	Dec. 16, 1890	Grain-weigher	Francis H. Richards	Hartford, CT
442,720	Dec. 16, 1890	Grain-weigher	Francis H. Richards	Hartford, CT
442,722	Dec. 16, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
442,723	Dec. 16, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
442,859	Dec. 16, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
		Grain-weigher	Francis H. Richards	Hartford, CT
442,860	Dec. 16, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
		Grain-weigher	Francis H. Richards	Hartford, CT
442,861	Dec. 16, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
		Grain-weigher	Francis H. Richards	Hartford, CT
443,569	Dec. 30, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
443,718	Dec. 30, 1890	Grain-weigher	Francis H. Richards	Hartford, CT
443,933	Dec. 30, 1890	Grain-weigher	Charles H. Cooley	Hartford, CT
		Grain-weigher	Francis H. Richards	Hartford, CT
446,898	Feb. 24, 1891	Rifling Machine	Charles W. Sponsel	Hartford, Hartford County, CT
447,719	Mar. 03, 1891	Register for Grain Weighers	Francis H. Richards	Hartford, Hartford County, CT
448,525	Mar. 17, 1891	Punching Machine	De Lancy Kennedy	New York, NY
482,212	Sep. 06, 1892	Grinding Fixture	William W. Tucker	Hartford, Hartford County, CT
496,828	May. 02, 1893	Ball Bearing for Lathe Spindles	George Hays	Hartford, Hartford County, CT
504,172	Aug. 29, 1893	Roll Grooving Machine	Francis A. Pratt	Hartford, CT
		Roll Grooving Machine	John Johnson	Hartford, CT
506,620	Oct. 10, 1893	Milling Machine	Edgar W. Bemis	Worcester, Worcester County, MA
515,292	Feb. 20, 1894	Tap Wrench	Albert H. Kent	Hartford, CT
531,203	Dec. 18, 1894	Lathe for Turning Elliptical Forms	Charles W. MacCord	Hoboken, Hudson County, NJ
533,978	Feb. 12, 1895	Milling-machine	Amos Whitney	Hartford, CT	Co-inventor Whitney was co-founder of the Pratt & Whitney Co. This invention is a machine for making bicycle sprocket-wheels. Co-inventor Johnston was a machine designer Pratt & Whitney. In 1893 Johnston left to co-found the Potter & Johnson Machine Co.
		Milling-machine	John Johnston	Hartford, CT
534,008	Feb. 12, 1895	Drop Hammer	Francis A. Pratt	Hartford, Hartford County, CT
534,220	Feb. 12, 1895	Milling Tool	Arthur H. Kent, deceased (Estate of)	Hartford, CT	Simonds, Burdett & Frothingham - patent attorneys The object of my invention is to provide what is known in the shops as an inserted tooth mill with means for securely clamping the removable teeth in the body part of the cutter, and to this end my invention consists of the details of the several parts making up the cutter body and the tooth holding clamp.
		Milling Tool	Edgar D. Clark, Administrator of the Estate	Hartford, CT
558,497	Apr. 21, 1896	Drilling Machine	Alfred W. Kinney	Hartford, Hartford County, CT
560,171	May. 12, 1896	Multiple drill	August J. Oehring	Chicago, IL	This was apparently a fairly important patent because the drill spindles were both universally (i.e., simultaneously) and individually adjustable. No previous drill had provided this combination of adjustability, where all adjustments could be made in all directions. The patent specification says "Assignor of one-third to the Pratt & Cady Company, of Hartford, Connecticut." A lawsuit involving this patent indicates that the assignee was the Pratt & Whitney Company. The lawsuit was against Wm. Gardam & Son of New York. The lawsuit originally resulted in a finding largely against the complainant, Pratt & Whitney, but the decision was reversed on appeal.
D25,719	Jun. 30, 1896	Design for a Gage	Oberlin Smith	Bridgeton, NJ	Elliptical body wire gage with a patent term of 14 years. Known example is marked: DECIMAL GAGE/MASTER MECHANICS as well as THE PRATT & WHITNEY CO./HARTFORD, CONN/U.S.A. and STANDARD/Patented June 30, 1896
588,056	Aug. 10, 1897	Screw Cutting Tool	Frank G. Echols	Hartford, CT	Five flute cutter instead of the standard four flute cutter and addition gaps between the cutting teeth to facilitate lubricant and chip movement. Applicable to both taps and dies. Known example marked: P&W CO. Frank G. Echols was a manager at the Pratt & Whitney Co.
588,222	Aug. 17, 1897	Tool Holder	Frank G. Echols	Hartford, Hartford County, CT	"Vintage Machinery" entry for Pratt & Whitney Co.
602,062	Apr. 12, 1898	Metal Working Machine	Frank G. Echols	Hartford, Hartford County, CT	Frank G. Echols was a manager at the Pratt & Whitney Co.
608,854	Aug. 09, 1898	Ball-bearing	Carl L. Grohmann	Hartford, CT	See patent 612,412 for more on co-inventor Carl L. Grohmann.
		Ball-bearing	Lewis E. Harper	Hartford, CT
610,158	Aug. 30, 1898	Tool for Cutting Screw Threads	Frank G. Echols	Hartford, Hartford County, CT	Frank G. Echols was a manager at the Pratt & Whitney Co.
616,851	Dec. 27, 1898	Weighing Machine	Frank E. Thompson	Hartford, Hartford County, CT
616,852	Dec. 27, 1898	Weighing Machine	John Christiansen	Hartford, Hartford County, CT
627,299	Jun. 20, 1899	Metal-working machine	Frank G. Echols	Hartford, CT	The machine in this patent was designed to manufacture the tap of patent 588,056 and constitutes a different approach from his earlier tap-making machine of patent 602,062.
627,349	Jun. 20, 1899	Drop Hammer Operating Means	Francis A. Pratt	Hartford, Hartford County, CT
627,350	Jun. 20, 1899	Drop Hammer Operating Means	Francis A. Pratt	Hartford, Hartford County, CT
627,529	Jun. 27, 1899	Screw Machine	George E. Randles	Hartford, Hartford County, CT
628,730	Jul. 11, 1899	Work Holder for Lathe Spindles	Amos Whitney	Hartford, Hartford County, CT
		Work Holder for Lathe Spindles	Frank Harrington	Hartford, Hartford County, CT
631,159	Aug. 15, 1899	Machine for Cold Rolling	Frank G. Echols	Hartford, Hartford County, CT	Frank G. Echols was a manager at the Pratt & Whitney Co.
644,279	Feb. 27, 1900	FeedAttachment for Screw or Analogous Machines	Elbert M. Couch	Hartford, Hartford County, CT
		FeedAttachment for Screw or Analogous Machines	Frank Harrington	Hartford, Hartford County, CT
644,310	Feb. 27, 1900	Multiple Spindle Screw Machine	Louis C. Woerner	Hartford, Hartford County, CT
		Multiple Spindle Screw Machine	Frank Harrington	Hartford, Hartford County, CT
659,962	Oct. 16, 1900	Turret-tool	Clarence L. Goodrich	Hartford, CT
662,900	Nov. 27, 1900	Chuck Operated Device	Augustus F. Kummel	Hartford, Hartford County, CT	Claim: This invention relates to improved means for operating the jaws of a rotating work-carrier of the class which in workshop phraseology is commonly termed a "chock" for delivering or feeding thereto the work or the objects to be carried and for gripping and releasing the said work at the desired times, whether the work-carrier is stationary or rotating in either direction.
		Chuck Operated Device	Clarence L. Goodrich	Hartford, Hartford County, CT
666,695	Jan. 29, 1901	Ratchet Drill	Joseph B. Renshaw	Hartford, Hartford County, CT
688,515	Dec. 10, 1901	Metal Working Machine	Bengt M. W. Hanson	Hartford, Hartford County, CT
698,008	Apr. 22, 1902	Change Gearing	Frederick W. Gordon	Hartford, Hartford County, CT
699,310	May. 06, 1902	Lathe Turret Stop	Bengt M. W. Hanson	Hartford, Hartford County, CT
701,719	Jun. 03, 1902	Lathe Turret Stop	Bengt M. W. Hanson	Hartford, Hartford County, CT
701,564	Jun. 03, 1902	Lathe Feed	Bengt M. W. Hanson	Hartford, Hartford County, CT
		Lathe Feed	Frederick W. Gordon	Hartford, Hartford County, CT
703,577	Jul. 01, 1902	Milling Cutter	Bengt M. W. Hanson	Hartford, Hartford County, CT
706,049	Aug. 05, 1902	Variable Speed Device	Bengt M. W. Hanson	Hartford, Hartford County, CT
		Variable Speed Device	Frederick W. Gordon	Hartford, Hartford County, CT
711,398	Oct. 14, 1902	Fluid Operated Stop Valve and Alarm	Bengt M. W. Hanson	Hartford, Hartford County, CT
711,851	Oct. 21, 1902	Feed Mechanism for Metal Working Machines	Bengt M. W. Hanson	Hartford, Hartford County, CT
711,852	Oct. 21, 1902	Feed Mechanism for Metal Working Machines	Bengt M. W. Hanson	Hartford, Hartford County, CT
714,894	Dec. 02, 1902	Relieving Attachment for Lathes	Bengt M. W. Hanson	Hartford, Hartford County, CT
714,895	Dec. 02, 1902	Clutch Operating and Feeding Device	Bengt M. W. Hanson	Hartford, Hartford County, CT	This patent was an improvement upon patent #118,481.
714,896	Dec. 02, 1902	Thrust Bearing for Collets	Bengt M. W. Hanson	Hartford, Hartford County, CT
726,678	Apr. 28, 1903	Lathe	Bengt M. W. Hanson	Hartford, CT	Mechanism for stopping and reversing the lathe carriage.
726,674	Apr. 28, 1903	Tool Holder for Screw Machines	Clarence L. Goodrich	Hartford, Hartford County, CT
728,458	May. 19, 1903	Fluid Pressure Operated Chuck	Bengt M. W. Hanson	Hartford, Hartford County, CT
728,572	May. 19, 1903	Fluid Pressure Operated Chuck	Bengt M. W. Hanson	Hartford, Hartford County, CT
731,870	Jun. 23, 1903	Indexing Mechanism	Francis G. Echols	Hartford, CT
731,871	Jun. 23, 1903	Friction Indexing Mechanism	Francis G. Echols	Hartford, Hartford County, CT
731,872	Jun. 23, 1903	Motor Mechanism	Francis G. Echols	Hartford, Hartford County, CT	Original application filed 25 Aug., 1902. Divided and the application filed 18 Dec., 1902.
732,184	Jun. 30, 1903	Dimensioning apparatus	Bengt M. W. Hanson	Hartford, CT
733,391	Jul. 14, 1903	Adjustable Tool Post	Bengt M. W. Hanson	Hartford, Hartford County, CT
750,108	Jan. 19, 1904	Tool-holder	Bengt M. W. Hanson	Hartford, CT
775,109	Nov. 15, 1904	Turret-tool	Bengt M. W. Hanson	Hartford, CT
782,240	Feb. 14, 1905	Indexing Mechanism	Bengt M. W. Hanson	Hartford, Hartford County, CT
782,243	Feb. 14, 1905	Feed Stop for Metal Working Machines	Bengt M. W. Hanson	Hartford, Hartford County, CT
795,222	Jul. 18, 1905	Gearing for lathes	Bengt M. W. Hanson	Hartford, CT	This quick-change gearbox mechanism was used for years on Pratt & Whitney lathes. The pinion-gear is carried on a lever that can slide side-to-side to align with the chosen cone gear, and then rocks forward to engage both the cone gear and the driving gear. This basic design was not new but many design details were covered by this patent, most of these refinements intended to strengthen and stiffen the mechanism.
801,787	Oct. 10, 1905	Bracing Attachment for Lathe Tool Carriages	Bengt M. W. Hanson	Hartford, Hartford County, CT
808,981	Jan. 02, 1906	Tool Holder	Clarence L. Goodrich	Hartford, Hartford County, CT
809,257	Jan. 02, 1906	Tool Holder	Bengt M. W. Hanson	Hartford, Hartford County, CT
814,648	Mar. 06, 1906	Chuck for Metalworking Machines	Bengt M. W. Hanson	Hartford, Hartford County, CT
847,573	Mar. 19, 1907	Chuck	Bengt M. W. Hanson	Hartford, CT
847,527	Mar. 19, 1907	Turning Attachment for Lathes	Arthur E. Thayer	Hartford, Hartford County, CT
867,198	Sep. 24, 1907	Foot Stock	Bengt M. W. Hanson	Hartford, Hartford County, CT
		Foot Stock	Arthur E. Thayer	Hartford, Hartford County, CT
876,543	Jan. 14, 1908	Friction Clutch	Bengt M. W. Hanson	Hartford, Hartford County, CT
905,518	Dec. 01, 1908	Chuck Actuating Device	Bengt W. Hanson	Hartford, Hartford County, CT
912,124	Feb. 09, 1909	Fluid Pressure Indexing Mechanism	Bengt M. W. Hanson	Hartford, Hartford County, CT
921,985	May. 18, 1909	Mechanism for shifting the cross-slides of lathes	Bengt M. W. Hanson	Hartford, CT
921,983	May. 18, 1909	Indexing Mechanism	Bengt M. W. Hanson	Hartford, Hartford County, CT
921,977	May. 18, 1909	Tool Holder	Clarence L. Goodrich	Hartford, Hartford County, CT
927,525	Jul. 13, 1909	Variable Speed Mechanism	Carl L. Grohmann	Hartford, Hartford County, CT
945,387	Jan. 04, 1910	Metal-working machine	Bengt M. W. Hanson	Hartford, CT
945,453	Jan. 04, 1910	Mechanism for actuating cross-slides	Bengt M. W. Hanson	Hartford, CT
945,455	Jan. 04, 1910	Reducing-machine	Bengt M. W. Hanson	Hartford, CT
945,456	Jan. 04, 1910	Metal-working machine	Bengt M. W. Hanson	Hartford, CT
945,454	Jan. 04, 1910	Feed Arresting Device	Bengt M. W. Hanson	Hartford, Hartford County, CT
948,697	Feb. 08, 1910	Gearing	Bengt M. W. Hanson	Hartford, Hartford County, CT
948,698	Feb. 08, 1910	Tool Holder	Bengt M. W. Hanson	Hartford, Hartford County, CT
963,144	Jul. 05, 1910	Tool Holder	Bengt M. W. Hanson	Hartford, Hartford County, CT
965,893	Aug. 02, 1910	Tool Holder	Bengt M. W. Hanson	Hartford, Hartford County, CT
968,047	Aug. 23, 1910	Attachment for Milling Machines	Carl L. Grohmann	Hartford, Hartford County, CT
968,052	Aug. 23, 1910	Tool Support for Turret Lathes	Bengt M. W. Hanson	Hartford, Hartford County, CT
975,356	Nov. 08, 1910	Belt Shifter	Bengt M. W. Hanson	Hartford, Hartford County, CT
983,226	Jan. 31, 1911	Grinding Machine	Bengt M. W. Hanson	Hartford, Hartford County, CT
984,809	Feb. 21, 1911	Chuck	Clarence L. Goodrich	Hartford, CT
1,063,160	May. 27, 1913	Forming Machine	Bengt M. W. Hanson	Hartford, CT
1,076,242	Oct. 21, 1913	Radial drill	Willard T. Sears	Hamilton, OH
1,084,544	Jan. 13, 1914	Shaper	Bengt M. W. Hanson	Hartford, Hartford County, CT
1,084,628	Jan. 20, 1914	Metal Reducing Machine	Bengt M. W. Hanson	Hartford, Hartford County, CT
1,089,442	Mar. 10, 1914	Radial drill	Willard Thomas Sears	Hartford, CT
1,104,988	Jul. 28, 1914	Metal Reducing Machine	Bengt M. W. Hanson	Hartford, Hartford County, CT
1,118,342	Nov. 24, 1914	Metal-working machine	Bengt M. W. Hanson	Hartford, CT	Improvements to patent 1,084,544.
1,122,649	Dec. 29, 1914	Adjusting mechanism	Willard Thomas Sears	Brooklyn, NY
1,140,326	May. 18, 1915	Clutch Mechanism	Bengt M. W. Hanson	Hartford, Hartford County, CT
1,182,170	May. 09, 1916	Head-stock	Bengt M. W. Hanson	Hartford, CT
1,182,477	May. 09, 1916	Boring-machine	Bengt M. W. Hanson	Hartford, CT	See patent 612,412 for more on co-inventor Carl L. Grohmann.
		Boring-machine	Carl L. Grohmann	Hartford, CT
1,182,478	May. 09, 1916	Steady Rest	Bengt M. W. Hanson	Hartford, Hartford County, CT
1,187,730	Jun. 20, 1916	Milling-machine	Bengt M. W. Hanson	Hartford, CT
1,187,920	Jun. 20, 1916	Chuck	Friederich MÃ¼ller	Hartford, CT
1,191,220	Jul. 18, 1916	Automatic back-rest	Gustaf E. Peterson	Hartford, CT
1,194,864	Aug. 15, 1916	Metal-working machine	Friederich MÃ¼ller	Hartford, CT
1,199,408	Sep. 26, 1916	Chucking device	Friederich MÃ¼ller	Hartford, CT
1,200,610	Oct. 10, 1916	Metal-working machine	Bengt M. W. Hanson	Hartford, CT
1,202,997	Oct. 31, 1916	Tail-stock	Bengt M. W. Hanson	Hartford, CT
1,211,840	Jan. 09, 1917	Metal-working machine	Bengt M. W. Hanson	Hartford, CT
RE14,299	May. 08, 1917	Automatic back-rest	Gustaf E. Peterson	Hartford, CT
1,233,994	Jul. 17, 1917	Machine for taper-forming	Richard F. Dow	Hartford, CT
1,237,511	Aug. 21, 1917	Lathe	Bengt M. W. Hanson	Hartford, CT	Improved mechanism for stopping and reversing the lathe carriage.
1,252,928	Jan. 08, 1918	Lathe	Friederich MÃ¼ller	Hartford, CT
1,273,904	Jul. 30, 1918	Tap Making Machine	Friederich MÃ¼ller	Hartford, CT	J. H. Freeman - patent attorney patent renewed 23 Oct, 1917
1,276,445	Aug. 20, 1918	Thread-cutter	Charles Havelock Taylor	ON, Canada
1,282,819	Oct. 29, 1918	Stop Mechanism for Lathes	Bengt M. W. Hanson	Hartford, CT	Keith Sutherlind - patent attorney Application renewed 31 Jul. 1918.
1,287,732	Dec. 17, 1918	Machine for Milling Knurls	Friederich MÃ¼ller	Hartford, CT	The invention relates to a milling machine primarily, intended and adapted for the cutting of spiral grooves in cylindrical blanks to form knurls. It will be understood, however, that while the machine is especially adapted for forming knurls, it may by suitable modifications, be adapted for other uses, and it will further be understood that several of the parts of the machine may be used separately from other parts and may be embodied in machines quite different in construction and operation. One of the objects of the invention is to provide a knurl milling or equivalent machine having two or more spindles upon which knurl blanks may be carried to be simultaneously milled. Another object of the invention is to provide improved means whereby all of the spindles may be simultaneously and uniformly indexed. A further object of the invention is to provide improved means whereby the knurl blanks and the milling cutters are separated from each other on the return movement. Another object of the invention is to provide improved means whereby right or left spiral grooves may be formed as required. Another object of the invention is to provide means for stopping the operation of the machine after a blank has been completely milled. Still another object of the invention is to provide an improved indexing mechanism. Additional objects of the invention will be apparent from the following specification and claims. In the accompanying drawings I have shown the embodiment of the invention which I now deem preferable, but it will be understood that the invention can be embodied in other ways and that the drawings are intended to be merely illustrative and are not intended to define or limit the scope of the invention.
1,287,731	Dec. 17, 1918	Automatic Grinding Machine	Friederich MÃ¼ller	Hartford, CT
1,299,125	Apr. 01, 1919	Cutting Tool	Alfred E. Carter	Providence, Providence County, RI
1,299,208	Apr. 01, 1919	Relieving Lathe	Friederich MÃ¼ller	Hartford, CT
1,318,223	Oct. 07, 1919	Lathe Tail-Stock	Frederick MÃ¼ller	Hartford, Hartford County, CT	Claim: The present invention is particularly applicable to tailstocks of the type set forth in my Patent No. 869,588 dated 29 October, 1907. Such a tailstock is especially well adapted to be used in connection with or as a part of an automatic lathe ofthe type set forth in my Patent No. 1,252,928, dated 08 January, 1918.
1,323,267	Dec. 02, 1919	Precision Boring Machine	Bengt M.W. Hanson	Hartford, CT	S. J. Teller - patent attorney
1,323,268	Dec. 02, 1919	Lubricating System	Bengt M. W. Hanson	Hartford, CT	S. J. Teller - patent attorney Patent renewed 30 Jun 1919.
1,323,276	Dec. 02, 1919	Metal Working Machine and Method	Frank O. Hoagland	Hartford, CT	Heath Sutherland - patent attorney
1,323,277	Dec. 02, 1919	Metal Working machine	Frank Hoagland	Hartford, CT	Heath Sutherland - patent attorney This invention relates to a machine which is similar in many respects to that set forth in my contemporaneously pending application filed April 5, 1917, Serial No. 159,883 (patent # 1,323,276. The present machine like that in said other application can be utilized in widely different arts, although it is of especial advantage in the production of bullets such for instance as are used in small arms. The present machine, like that in the aforesaid application, comprises mechanism for supporting a blank and for supplying to the blank one or. a succession of blows upon its surface. In the earlier application before referred to, I have shown a machine having two rotatable rollers for applying a plurality of blows in rapid succession to the surface of the blank, these blows being delivered by means of ribs formed on the surface of two rapidly rotating rollers arranged side by side. In the present case I make use of an outer annular roller and an inner roller which is surrounded by the outer roller and which is arranged eccentrically with respect thereto. The bullet blank is engaged and acted upon by the surfaces of the two rollers at the throat where the surfaces are close together.
1,323,280	Dec. 02, 1919	Limit Gage	Frank O. Hoagland	Hartford, Hartford County, CT
1,323,279	Dec. 02, 1919	Barrel Straightening Mechanism	Frank O. Hoagland	Hartford, Hartford County, CT
1,392,313	Oct. 04, 1921	Screw Thread Gage	Galvin S. Fallow	Wethersfield, CT	S. J. Teller - patent attorney
1,405,922	Feb. 07, 1922	Wheel Guard for Grinding Machines	Carroll Knowles	Hartford, Hartford County, CT
1,424,764	Aug. 08, 1922	Surface Grinder	Carroll Knowles	Hartford, Hartford County, CT
223,267	Aug. 29, 1922	Thread cutter	Charles Havelock Taylor	ON, Canada	See US patent 1,276,445.
1,429,614	Sep. 19, 1922	Milling Cutter for Gears	Frederich MÃ¼ller	Hartford, Hartford County, CT	Application renewed 24 Mar., 1922.
1,434,699	Nov. 07, 1922	Lead Gauge for Threads	Frank O. Hoagland	Hartford, Hartford County, CT
RE15,625	Jun. 12, 1923	Thread-cutter	Charles Havelock Taylor	ON, Canada
1,458,633	Jun. 12, 1923	Lathe Tool Holder	Paul F. Vokal	Hartford, Hartford County, CT
1,470,836	Oct. 16, 1923	Lead Measuring Machine for Gauges	Reuben Hill	Hartford, Hartford County, CT
1,472,827	Nov. 06, 1923	Cutter Grinding Attachment	Alfred W. Erdman	Hartford, Hartford County, CT
1,480,611	Jan. 15, 1924	Measuring Machine	Reuben Hill	Hartford, CT	S. J. Teller - patent attorney
1,480,610	Jan. 15, 1924	Gear Cutter	John Harten	Hartford, Hartford County, CT
1,486,337	Mar. 11, 1924	Machine for Making Gauges and Other Articles	William E. Hoke	St. Louis, MO
1,487,834	Mar. 25, 1924	Reversible Gauge	Bryant H. Blood	Hartford, Hartford County, CT
1,490,405	Apr. 15, 1924	Tailstock	Richard F. Stanton	Hartford, Hartford County, CT
1,490,413	Apr. 15, 1924	Linear Measuring Machine	Bryant H. Blood	Hartford, Hartford County, CT
1,501,252	Jul. 15, 1924	Thread Milling Machine	George T. Trundle Jr.	Cleveland, Cuyahoga County, OH
1,507,265	Sep. 02, 1924	Automatic lathe	John J. Thacher	Wethersfield, CT	Improvements to the automatic lathe of patent 1,252,928. The improvements provide improvements for the two-speed driving of the "main cam shaft" as well as improved operation and controlling of the blank transferring means from magazine to the lathe centers. A taper attachment is provided, and a speed lockout prevents the operator from changing speeds while the lathe is in operation. Finally, an improved stopping mechanism incorporates an emergency stop.
1,507,272	Sep. 02, 1924	Internal Expansion Gauge	Earle Buckingham	Hartford, CT	S. J. Teller - patent attorney
1,508,794	Sep. 16, 1924	Lathe-tool mechanism	Walter E. Ingham	Newington, CT	This patent date was seen on a Pratt & Whitney 13-inch Model B lathe.
1,512,626	Oct. 21, 1924	Bench Type Gear Testing Machine	Paul M. Mueller	Hartford, Hartford County, CT
1,513,758	Nov. 04, 1924	Shaper for Grinding Wheels	Bengt M. W. Hanson	Hartford, Hartford County, CT
1,516,196	Nov. 18, 1924	Plain Relieving Attachment for Lathes	August Bernhard Lindstrom	Hartford, Hartford County, CT
1,516,162	Nov. 18, 1924	Chuck Operating Means	John J. Thacher	Wethersfield, Hartford County, CT
1,516,477	Nov. 18, 1924	Lost Motion Means for Gear Hobbing Machines	Joseph K. Schofield	Hartford, Hartford County, CT
1,521,340	Dec. 30, 1924	Automatic Lathe	Spencer Jay Teller	Hartford, Hartford County, CT
1,524,892	Feb. 03, 1925	Gear Testing Device	Hubert D. Tanner	Hartford, Hartford County, CT
1,529,296	Mar. 10, 1925	Gauge	Bryant H. Blood	Hartford, Hartford County, CT
1,533,369	Apr. 14, 1925	Thread Gauge Construction	Bryant H. Blood	Hartford, Hartford County, CT
1,535,267	Apr. 28, 1925	Spindle-stop mechanism	John J. Thacher	Wethersfield, CT
1,536,736	May. 05, 1925	Process of Making Milling Cutters	Paul F. Vokal	Hartford, Hartford County, CT
		Process of Making Milling Cutters	Albert W. Erdman	Hartford, Hartford County, CT
1,536,734	May. 05, 1925	Bevel Gear Testing Device	Hubert D. Tanner	Hartford, Hartford County, CT
1,540,899	Jun. 09, 1925	Combined Metal Cutting Machine	Frederich MÃ¼ller	Hartford, Hartford County, CT
1,543,242	Jun. 23, 1925	Milling machine	Frederick C. Allen	Hartford, CT	This patent was assigned to Pratt & Whitney Co., but it was reissued four years later and the reissue was assigned to Kearney & Trecker Corp.
1,545,052	Jul. 07, 1925	Lathe	Walter E. Ingham	Newington, CT	This patent date was seen on a Pratt & Whitney 13-inch Model B lathe.
1,545,074	Jul. 07, 1925	Tailstock	John J. Thacher	Wethersfield, CT	This lathe tailstock is intended for use with the automatic lathe of patent 1,507,265.
1,547,514	Jul. 28, 1925	Thread Testing Device	Paul M. Mueller	Hartford, Hartford County, CT	Joseph K. Schofield, patent attorney This invention relates to a thread testing device, and in particular to a device for rapidly determining the accuracy of a number of similar screw threaded members. An object of the present invention is to provide a screw thread testing device which may be adjusted over a wide range of sizes and adapted to quickly compare the accuracy's of a number of screw threads with a standard screw thread of the same nominal size. Another object of the invention is to provide a device which by substitution of different forms and sizes of screw thread contacting members and by adjustment of the positions of the screw thread contacting members may be used for comparing the dimensions of a number of different types and sizes of screw threads within a wide range. One feature which enables me to accomplish the above objects is that I provide a pair of oppositely disposed screw thread gaging or contacting members having serrated edges corresponding in outline to the particular form of screw threads being examined and, by permitting different sets of contacting members to be readily and quickly substituted, any number of different forms of screw threads may be tested. Another feature which is advantageous is that one of the screw thread contacting members is so mounted that it is adjustable over a wide range to accommodate screw threaded members of varying diameters and the oppositely disposed contacting member is flexibly or resiliently mounted so that it may have a limited movement toward or from the first contacting member. Means are also provided whereby the position of the flexibly mounted contacting member may be determined to a high degree of precision when in screw thread engaging position, so Another object of the invention is to provide contacting members adapted to engage but one thread on either side of the specimen being tested so that the inaccuracy in diameter can be determined independently of any error in the lead or pitch of the screw threads. By the use of both forms of gaging or contacting members upon a specimen and a standard, the error, if any, in lead or pitch can be approximately calculated. It is also an object of the invention to arrange the contacting members and to support the member being tested in such a way that light may be reflected and transmitted through the base of the device so that the contact between the contacting members and cs the screw threaded body may be visually examined, and errors of pitch and angle of sides of the screw threaded body being tested may be readily ascertained. A further object of the invention is to provide a suitable adjustable support for the specimen being tested permitting the specimen to be rapidly placed in operative position relative to the contacting or gaging members. It is also an object of the invention to provide a support suitable not only for plain screw threaded members but for such members as taps in which the gaging members must contact at points on the screw threaded portions near the cutting edges.
1,549,635	Aug. 11, 1925	Thread Gauge	Paul F. Vokal	Hartford, CT	This invention relates to gauges and particularly to a thread gauge for measuring the pitch diameter of threading taps. Such a tap ordinarily comprises a plurality of spaced thread cutting lands there around, as shown in the accompanying drawing. It is of course essential that the pitch diameter of these taps shall be accurate within certain limits and it is the primary object of this invention to provide a gauge particularly adapted to measure such diameter. It is a further object of the invention to provide a U-shaped gauge having a pair of anvils on one arm thereof for engaging the threads on two adjacent lands of a tap and a cooperating micrometer-operated thread engaging element on the other arm for engaging the threads on a land opposite the said two adjacent lands, the said anvils and their supporting element preferably being loosely mounted whereby to freely adjust themselves to the threads being gauged.
1,560,697	Nov. 10, 1925	Dressing Attachment for Veritcal Surface Grinders	Carroll Knowles	Hartford, Hartford County, CT
1,582,669	Apr. 27, 1926	Screw Thread Cutting Means for Bench Lathes	Henry E. Durkee	Glastonbury, Hartford County, CT
1,586,186	May. 25, 1926	Milling Hob	Albert W. Erdman	Hartford, Hartford County, CT
1,588,003	Jun. 08, 1926	Thread-hobbing machine	Bryant H. Blood	Hartford, CT
1,594,393	Aug. 03, 1926	Grinding Wheel Dressing Attachment	Paul F. Vokal	Hartford, Hartford County, CT
1,611,048	Dec. 14, 1926	Back Rest for Cylindrical Grinders	Carroll Knowles	Hartford, Hartford County, CT
1,616,136	Feb. 01, 1927	Tailstock Clamp	Edward A. Moyer	West Hartford, Hartford County, CT
1,626,953	May. 03, 1927	Tool Post	Frederich MÃ¼ller	Elizabeth, Essex County, NJ	Original application filed 14 Dec., 1921. Divided and this application filed 07 Dec., 1923.
1,632,600	Jun. 14, 1927	Internal Grinding Machine	Frank O. Hoagland	Bridgeport, Fairfield County, CT	Application renewed 12 May 1926.
1,656,347	Jan. 17, 1928	Sizing Device for Surface Grinders	John A. Doane	West Hartford, Hartford County, CT
1,659,247	Feb. 14, 1928	Full Automatic Thread Hobbing Machine	John A. Doane	Hartford, Hartford County, CT
1,664,741	Apr. 03, 1928	Relieving Attachment	James W. Durkee	Hartford, Hartford County, CT
1,664,745	Apr. 03, 1928	Fluid Pump	Frank O. Hoagland	Bridgeport, Fairfield County, CT
1,669,873	May. 15, 1928	Snap Gauge	Frank O. Hoagland	Bridgeport, Fairfield County, CT
1,674,973	Jun. 26, 1928	Grinding Machine	Arthur L. Kline	Detroit, Wayne County, MI
		Grinding Machine	Charles F. Clark	Detroit, Wayne County, MI
1,743,604	Jan. 14, 1930	Adapter for Segmental Abrasive Wheels	Frank O. Hoagland	Bridgeport, Fairfield County, CT
1,745,573	Feb. 04, 1930	Vertical Shaping Machine	John J. Harten	Hartford, Hartford County, CT
1,840,361	Jan. 12, 1932	Spindle Rotating Means for Milling Machines	Frank O. Hoagland	Bridgeport, Fairfield County, CT
1,851,283	Mar. 29, 1932	Gauge	Charles G. Johnson	Hartford, Hartford County, CT	Arthur B. Jenkins - patent attorney
1,897,666	Feb. 14, 1933	Machine Tool Spindle	Frank O. Hoagland	West Hartford, Hartford County, CT
1,904,395	Apr. 18, 1933	Spindle Bearing	Alexander G. Whitehead	Hartford, Hartford County, CT
1,918,952	Jul. 18, 1933	Flexible Shaft Bench Grinder	Alwin B. Bachmann	Brooklyn, Kings County, NY
		Flexible Shaft Bench Grinder	William Krause	Bronx, Bronx County, NY
1,961,605	Jun. 05, 1934	Standard Spindle Nose	Alfred E. Drissner	Cleveland, Cuyahoga County, OH
		Standard Spindle Nose	Frank O. Hoagland	West Hartford, Hartford County, CT
		Standard Spindle Nose	Max E. Lange	Cleveland Heights, Cuyahoga County, OH
		Standard Spindle Nose	Nils Ivar Lundberg	Madison, Dane County, WI
		Standard Spindle Nose	John E. Lovely	Springfield, Windsor County, VT
1,980,336	Nov. 13, 1934	Chuck Retaining Means	Frank O. Hoagland	West Hartford, Hartford County, CT
2,101,177	Dec. 07, 1937	Bench Type Machine Tool	Frank O. Hoagland	West Hartford, Hartford County, CT
2,440,916	May. 04, 1948	Precision Measuring and Postioning Device	John M. Rusnak	West Hartford,Hartford County, CT	This patent is listed on a Pratt & Whitney 2E Jig Borer.
		Precision Measuring and Postioning Device	James W. Durkee	Manchester, Hartford County, CT
2,991,558	Jul. 11, 1961	Air Gage Cartridge	Paul Cherkas	West Hartford, Hartford County, CT
2,997,873	Aug. 29, 1961	Pneumatic Dimension Gage	Albert M. Dexter Jr.	Farmington, Hartford County, CT
3,136,561	Jun. 09, 1964	Collet for Fluted Shankless Tool	John F. McAuliffe	Elmwood, Hartford County, CT
		Collet for Fluted Shankless Tool	Anthony D. Parone	Elmwood, Hartford County, CT
3,182,488	May. 11, 1965	Fluid Gage Adjusting Unit	Allen R. Hollister	East Hartford, Hartford County, CT
3,241,356	Mar. 22, 1966	Gage Plug	William J. Blaiklock	Collinsville, Hartford County, CT	Rockwell & DeLio - patent attorneys
3,347,116	Oct. 17, 1967	Automatic Measuring Lead Screw Compensator	Robert F. Anderson	Simsbury, Hartford County, CT
		Automatic Measuring Lead Screw Compensator	Allen R. Hollister	East Hartford, Hartford County, CT
		Automatic Measuring Lead Screw Compensator	Johann F. Reuteler	Elmwood, Hartford County, CT
3,586,949	Jun. 22, 1971	Three-Phase Motor Control System	Carles F. Raber	Simsbury, Hartford County, CT	"This invention is directed to a three-phase DC motor drive for use in conjunction with machine tools for driving a spindle or a slide. In particular, the invention comprises a silicon controlled rectifier (SCR) assembly, utilized to permit three-phase line voltages to be applied across the armature of a DC motor. A tachometer is utilized to generate a signal indicative of the motor speed which is combined with a command signal and a current limit signal. From the combination of these signals, a signal is generated to control the firing of the SCR assembly. This invention includes the use of saturable reactors to prevent one of the SCR's of the assembly from firing while another is conducting. Also as an important feature of this invention, there is provided tachometer ripple cancellation in order to obtain a low noise output signal from the tachometer."
		Three-Phase Motor Control System	Kenneth D. Spear	Southington, Hartford County, CT