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US Patent: 2,640,381
Tool
Patentee:
Howard H. Manning - Meadville, PA

USPTO Classifications:
81/414

Tool Categories:
pliers

Assignees:
Champion De Arment Tool Company - Meadville, PA

Manufacturer:
Champion De Arment Tool Co. - Meadville, PA

Witnesses:
Unknown

Patent Dates:
Applied: Jul. 09, 1951
Granted: Jun. 02, 1953

Patent Pictures:
Howard H. Manning Pat. June 2, 1953
USPTO pdf tiff
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Description:
The patent focuses on the shape of the arcuate ribs which work to keep the jaw faces in alignment. The patent cites nos. 588,991 and 1,950,362 as references. The patent is clearly an evolution of no. 2,592,927 although that patent is not mentioned. The patent number appears on later versions of ChannelLock pliers.

Some pliers with this patent number are also marked PAT. IN CAN. 1953

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