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US Patent: 657,391
Wrench
Patentee:
Thomas H. Brosnihan (exact or similar names) - Livermore Falls, ME

USPTO Classifications:
81/171, 81/179, 81/185.2

Tool Categories:
wrenches : pipe wrenches

Assignees:
None

Manufacturer:
Brosnihan Wrench Co. - Worcester, MA
Sargent & Co. - New Haven, CT

Witnesses:
Julius Lutz
Theo. G. Hoster
I. B. Clary
Wm. H. Allen

Patent Dates:
Applied: Dec. 15, 1899
Granted: Sep. 04, 1900

Patent Pictures: [ 1 | 2 ]
Thomas H. Brosnihan patent Sept. 4, 1900
USPTO (New site tip)
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Description:
The key elements of the patent are the hardened pipe-gripping jaw faces. The pipe-gripping jaw face on the adjustable jaw slides on a keyway-shaped base, and is pressed outward by a spring.

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