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US Patent: D28,487
Wrench Jaw
Henry J. Martin - Chicago, IL

USPTO Classifications:

Tool Categories:
wrenches : wrench components : wrench jaw components
wrenches : pipe wrenches

Whitman and Barnes Manufacturing Co. - Akron, OH

Whitman and Barnes Mfg. Co. - Chicago, IL

William Stone
C. G. Everson

Patent Dates:
Applied: Jun. 23, 1897
Granted: Apr. 19, 1898

Patent Pictures: [ 1 | 2 | 3 ]
Henry J. Martin Pat. April 19, 1898
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The piece is roughly triangular, with teeth on two faces. It is the renewable gripping surface for the Whitman & Barnes improved pipe wrench. It evolved from the Frank S. Cook May 19, 1891 wrench jaw patent (no. 452,518) which appears on a "Stillson" type pipe wrench produced by W&B.

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