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US Patent: 444,372
Pipe Wrench
Patentee:
John C. Sproull - Bedford, IN

USPTO Classifications:
81/98

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Sproull Wrench Company - Bedford, IN

Witnesses:
C. P. Jacobs
H. D. Nealy
E. B. Griffith

Patent Dates:
Applied: Oct. 04, 1890
Granted: Jan. 06, 1891

Patent Pictures: [ 1 | 2 ]
John C. Sproull patent January 6, 1891
USPTO pdf tiff
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Description:
Swinging hook jaw pipe wrench. The patent claims some very subtle shape distinctions, including the square hook towards the tip of the hook jaw.

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