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US Patent: 397,618
Pipe Wrench
Patentee:
John H. Vinton - Boston, MA

USPTO Classifications:
81/101

Tool Categories:
wrenches : pipe wrenches

Assignees:
Trimont Manufacturing Company - Portland, ME

Manufacturer:
Trimont Mfg. Co. - Portland, ME
Trimont Mfg. Co. - Roxbury, MA

Witnesses:
Bernice J. Noyes
Fredk. L. Emery

Patent Dates:
Applied: Aug. 06, 1888
Granted: Feb. 12, 1889

Patent Pictures: [ 1 | 2 ]
J. H. Vinton Pat. Feb. 12, 1889
USPTO pdf tiff
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1889 TRIMO pipe wrench (FLICKR)
Description:
Patent covers the thread form on the adjusting knurl and movable jaw, the adjusting knurl for a pipe wrench and the frame holding the knurl. The earliest ads for the TRIMO pipe wrench show a construction like this patent. Extant early TRIMO pipe wrenches show features from this patent together with some from with utility patent no. 414,663 and design patent no. D19,168.

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