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US Patent: 404,619
Pipe Wrench
Patentee:
John T. Hawkins - Taunton, MA

USPTO Classifications:
81/175, 81/179, 81/186

Tool Categories:
wrenches : alligator wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
E. O. Evans
Francis P. Reilly
Albert J. Park
Frederick A. Merigold

Patent Dates:
Applied: Dec. 07, 1888
Granted: Jun. 04, 1889

Patent Pictures:
John T. Hawkins patent June 4, 1889
USPTO pdf tiff
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Description:
An adjustable "stop" in an alligator wrench prevents pipe from jamming too far into the "V" and crushing.

Patent no. 413,940 (Oct. 29, 1889) is a further refinement -- Canadian patent CA-34,269 (May 7, 1890) combines features of both patents into one set of claims.

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