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US Patent: 42,827
Improvement in devices for holding bits and other tools
William Henry Barber - Greenfield, MA

USPTO Classifications:

Tool Categories:
industrial tools : tool holders
tool holders


William H. Barber - Greenfield, MA
Millers Falls Manufacturing Co. - Greenfield, MA

Wendell T. Davis
Austin De Wolf

Patent Dates:
Granted: May 24, 1864

Patent Pictures: [ 1 | 2 ]
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Millers Falls Manufacturing Co. applied for a reissue of this patent. The third claim of the application for the reissue, relating to closing the jaws of a tool-holder by means of an internally-threaded sleeve around the jaws, was anticipated by Chamberlain's patent 10,500. Millers Falls argued that their design allowed it to hold various sizes of tools where Chamberlain's design did not. The patent examiner found, and the commissioner upheld, that the designs were not sufficiently different to support any reinterpretation of the claim, and therefore no reissue would be granted. Although not explicit, the implication is that this patent would not withstand any challenge from Chamberlain for infringement. However, this patent was never disclaimed, in whole or in part.

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