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US Patent: 404,770
Pipe Wrench
Improvement in Alligator-Wrenches
Edward S. Boynton - New York, NY

USPTO Classifications:
81/116, 81/186

Tool Categories:
wrenches : wrench adjustment types : screw adjust wrenches
wrenches : alligator wrenches

Campbell Printing Press and Mfg. Co. - New York, NY

Campbell Printing Press and Mfg. Co. - New York, NY

Francis P. Reilly
Frank L. Entwisle
John Tully

Patent Dates:
Applied: Nov. 26, 1888
Granted: Jun. 04, 1889

Patent Pictures: [ 1 | 2 ]
Edward S. Boynton Pat. June 4, 1889
USPTO pdf tiff
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The improvement is "steps" or "stops" on the smooth jaw of an adjustable alligator wrench which help alleviate the problem of crushing pipe. The improvement is applied to Boynton's June 14, 1887 patent (no. 364,749).

Corresponding British patent GB-188909299 was registered June 4, 1889.

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