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US Patent: 413,961
Pipe Wrench
Patentee:
Daniel R Porter (exact or similar names) - Chelsea, MA

USPTO Classifications:
81/140, 81/92

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

Assignees:
William F. Goldthwaite - Chelsea, MA

Manufacturer:
Not known to have been produced

Witnesses:
C. F. Brown
A. D. Harrison
W. B. Ramsey

Patent Dates:
Applied: Mar. 15, 1889
Granted: Oct. 29, 1889

Patent Pictures:
Daniel R. Porter patent October 29, 1889
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Description:
A spring-loaded lever at the base of movable jaw has teeth engaging a rack on the main shank to hold the adjustment.

Corresponding Canadian patent no. CA-31,072 was granted April 9, 1889.

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