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US Patent: 661,011
Pipe and Nut Wrench
Involute Wrench
Maschil D. Converse - New York, NY

USPTO Classifications:
81/119, 81/120, 81/186, 81/95

Tool Categories:
wrenches : alligator wrenches
wrenches : pipe and nut combination wrenches

John J. Tower - New York, NY

Tower and Lyon - New York, NY

L. C. Hills
W. R. Taylor
George W. Poe
E. E. Overholt

Patent Dates:
Applied: Jun. 07, 1900
Granted: Oct. 30, 1900

Patent Pictures: [ 1 | 2 | 3 ]
Maschil D. Converse Pat. Oct. 30, 1900
USPTO pdf tiff
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"A wrench with a rigid arc-shaped fulcrum jaw, and a rigid circumscribing jaw ... the teeth on the circumscribing jaw shall be ranged on a true involute line ... "

A December 1906 HARDWARE DEALERS' announcement notes two sizes; No. 1 at 5 1/2 inches and No. 2 at 9 inches. The larger size is far less common than the No. 1 size.

The STEEL CITY ELECTRIC CO RED HEAD wrench looks similar, but appears to be based on patent no. 1,896,437.

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