US Patent: 397,618 - Pipe Wrench


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US Patent: 397,618

Pipe Wrench

Patentee:

John H. Vinton (exact or similar names) - 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 ]

John H. Vinton patent Febr. 12, 1889

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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.