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US Patent: 737,847
Pipe Wrench
Leader Pipe Wrench
George Walker Johnson - Erie, PA

USPTO Classifications:
81/175, 81/177.1, 81/98

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


Ripley Pipe Wrench Company - Ripley, NY

R. A. Johnson
C. H. Jordan

Patent Dates:
Applied: Apr. 11, 1903
Granted: Sep. 01, 1903

Patent Pictures: [ 1 | 2 ]
George W. Johnson patent Sept. 1, 1903 with 8 inch example from Don Ervin collection
USPTO pdf tiff
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The wrench has a swinging "hook" jaw and an adjustable jaw running up the center of a malleable iron combination frame and handle. Manufacturer identification and name "LEADER PIPE WRENCH" taken from Dec. 3, 1908 "IRON AGE."

The adjustable jaw is a carry over from the second of Johnson's two pipe tongs patents (nos. 460,015 and 540,790).

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