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.
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609,836
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Aug. 30, 1898
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Drop Hammer
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George Rowbottom |
Waterbury, New Haven County, CT |
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624,101
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May. 02, 1899
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Drop Hammer
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George Rowbottom |
Waterbury, New Haven County, CT |
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Drop Hammer
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David C. Griggs |
Waterbury, New Haven County, CT |
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851,677
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Apr. 30, 1907
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Drop Hammer
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George B. Lamb |
Waterbury, New Haven County, CT |
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Drop Hammer
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David C. Griggs |
Waterbury, New Haven County, CT |
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2,641,047
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Jun. 09, 1953
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Cutting Tool
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George W. Jackman |
Waterbury, New Haven County, CT |
Claim:
In metal cutting operations, it is common practice to throw large quantities of a liquid coolant on the cutting tool to prevent it from reaching excessively high temperatures. However, during the process of flooding the cutting tip of the tool, the chip is also flooded and cooled, increasing its shear strength, and, therefore, making it more difficult to machine and deform than if allowed to retain its friction-generated heat. |