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US Patent: 956,280
One-Piece Pipe Wrench
George Bryar - Boston, MA

USPTO Classifications:
81/120, 81/52, 81/92

Tool Categories:
wrenches : alligator wrenches
wrenches : pipe wrenches

Franklin Playter - Boston, MA

Shaw Propellor Co. - Boston, MA
Billings and Spencer - Springfield, MA

Robert H. Kammler
Horace A. Grossman
Frederic Gilbert Bay
Everett S. Emery

Patent Dates:
Applied: Apr. 18, 1908
Granted: Apr. 26, 1910

Patent Pictures: [ 1 | 2 ]
George Bryar Pat. Apr. 26, 1910
USPTO pdf tiff
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The long slot in the handle provides the spring action to allow the alligator wrench jaws to grip and release pipe.

Compare this to Frederick E. Walden's March 9, 1920 patent (no. 1,333,517), produced as the WAL-PAT pipe wrench.

Daniel R. Porter's January 10, 1888 adjustable pipe wrench (pat. no. 376,396) also had a wedge-shaped opening and a springing jaw.

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