Electro-Magnetic Tool Co.; SpeedWay Manufacturing Co. - Assigned Patents

Manufacturers Index - Electro-Magnetic Tool Co.; SpeedWay Manufacturing Co.

Electro-Magnetic Tool Co.; SpeedWay Manufacturing Co.
Cicero, IL, U.S.A.
Manufacturer Class: Wood Working Machinery & Metal Working Machinery

Patents

This page contains information on patents issued to this manufacturer.

Submitting Patent Information

If you find a patent number or patent date by this manufacturer that is not on this list, please contact the Site Historian.

Key to Links for Patent Information

USPTO = U.S. Patent Office . Images of the actual patent can be viewed on the U.S. Patent Office web site but a special TIFF viewer must be installed with your browser in order properly work. More information on how to configure your computer to view these patents can be found at TIFF image Viewers for Patent Images.
DATAMP = Directory of American Tool And Machinery Patents . A sister site to VintageMachinery.org with information on patents related to machinery and tools. A much easier user interface than the USPTO's for finding information on machinery patents.

Patent Number	Date	Title	Name	City	Description
894,782	Jul. 28, 1908	Electromechanical device	George H. Rowe	Riverside, IL	This invention was an electromechanical impact device. The initial application was a rock hammer-drill for use in mining, but subsequent improvements adapted it for use as a stamp mill (patent 938,708), riveting gun (patents 973,216, 938,709, and 1,298,966), and power hammer (patent 1,024,027). Further improvements for use as a hammer drill are to be found in patents 1,024,025 and 1,024,026.
CA-120,598	Sep. 21, 1909	Electro-mechanical device	George Herbert Rowe	Chicago, IL	This is the Canadian equivalent of US patent 894,782.
938,708	Nov. 02, 1909	Electromechanical device	George H. Rowe	Riverside, IL	Improvements to the inventor's patent 894,782 to adapt that mechanism for use in a stamp mill, which is used to break up rock in ore processing.
938,709	Nov. 02, 1909	Electromechanical device	George H. Rowe	Berwyn, IL	This patent contains improvements to a patent that was approved after this one: 973,216.
973,216	Oct. 18, 1910	Electromechanical device	George H. Rowe	Berwyn, IL	Improvements to patent 894,782 to eliminate the air gap in the magnetic circuit, which allows the device to be made lighter and more compact. The present patent's innovations were improved in patent 938,709, which was issued much more quickly than this one was.
1,024,025	Apr. 23, 1912	Percussion device	George H. Rowe	Berwyn, IL
1,024,026	Apr. 23, 1912	Electromechanical device	George H. Rowe	Berwyn, IL	Improvements to patents 894,782, 938,709, 973,216, and what would become patent 1,062,799.
1,024,027	Apr. 23, 1912	Electromechanical device	George H. Rowe	Chicago, IL	This invention relates to electromagnetic impact devices, and uses vacuum on one side of the hammer, and air pressure on the other, each reinforcing the magnetic attraction. This invention was claimed to be especially useful in energy savings with large heavy impact devices such as power hammers. The inventor was developing an electrical power hammer intended to replace a steam hammer.
1,062,799	May. 27, 1913	Electromechanical device	George H. Rowe	Chicago, IL	Improvements to patent 938,709.
1,082,880	Dec. 30, 1913	Mechanical hammer	James S. Knowlson	La Grange, IL
1,298,966	Apr. 01, 1919	Electrically-operated tool	James S. Knowlson	Oak Park, IL	Improvements to patent 938,709.
CA-218,476	May. 09, 1922	Electrically operated tool	James Somerville Knowlson	Oak Park, IL	This is the Canadian equivalent of US patent 1,298,966.
DE-390,538	Feb. 20, 1924	Elektrisch angetriebenes schlagwerkzeug	James S. Knowlson	Oak Park, IL	This is the German equivalent of US patent 1,298,966. The inventor's name does not appear on the German patent but we infer it from the US patent.
1,577,976	Mar. 23, 1926	Power-driven tool-operating device	Robert S. McKeage	Chicago, IL
		Power-driven tool-operating device	James S. Knowlson	Oak Park, IL
1,598,088	Aug. 31, 1926	Mechanical movement	James S. Knowlson	Oak Park, IL
		Mechanical movement	James Larocca	Chicago, IL
1,598,090	Aug. 31, 1926	Impacting tool	James Larocca	Cicero, IL
1,598,091	Aug. 31, 1926	Impacting tool	James Larocca	Cicero, IL
1,782,927	Nov. 25, 1930	Electric power device	James S. Knowlson	Hinsdale, IL
1,782,928	Nov. 25, 1930	Humidifier	James S. Knowlson	Hinsdale, IL
1,803,068	Apr. 28, 1931	Rotary cutter device	Robert S. McKeage	Cicero, IL
2,100,809	Nov. 30, 1937	Self-starting single phase alternating-current induction motor	James Larocca	Chicago, IL
2,178,691	Nov. 07, 1939	Reversible alternating current induction motor	James Larocca	Chicago, IL
2,683,336	Jul. 13, 1954	Rubbing machine	Steven E. Scace	Cicero, IL
2,683,337	Jul. 13, 1954	Paper clamping device for sanding machines	Steven E. Scace	Cicero, IL