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US Patent: 35,971
Improvement in Wrenches
Pipe Wrench
J. H. Doolittle - Derby, CT

USPTO Classifications:

Tool Categories:
wrenches : pipe wrenches
wrenches : alligator wrenches

Franklin Farrel - Ansonia, CT
J. H. Doolittle - Derby, CT

Not known to have been produced

George Bristol
J. Kellingbeck

Patent Dates:
Applied: Apr. 21, 1862
Granted: Jul. 22, 1862

Patent Pictures:
J. H. Doolittle Pat. July 22 ,1862
USPTO pdf tiff
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The patent covers the concept of a wedge-shaped jaw pair (the angle less than 90 degrees), with one face roughened or serrated to enable it to grip pipe or round objects. This is the earliest patent for what commonly became known as the alligator wrench.

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