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US Patent: 450,681
Wrench
Patentee:
Daniel R. Porter (exact or similar names) - Chelsea, MA

USPTO Classifications:
81/101

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

Assignees:
Daniel R. Porter - Chelsea, MA
William F. Goldthwait - Chelsea, MA

Manufacturer:
Not known to have been produced

Witnesses:
A. D. Harrison
C. G. Partlett
Arthur W. Crossley

Patent Dates:
Applied: May 10, 1890
Granted: Apr. 21, 1891

Patent Pictures:
Daniel R. Porter patent April 21, 1891
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Description:
Improvement to patent no. 426,956. "Ears" extending from the frame hold and align the adjusting nut of a "Stilson" type pipe wrench. Corresponding British patent GB-189106878 was registered April 21, 1891; Canadian patent CA-41,437 was granted Dec. 30, 1892.

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