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US Patent: 1,004,792
Pipe Wrench
William Louis Bessolo - Denver, CO

USPTO Classifications:
81/65.4, 81/69

Tool Categories:
wrenches : pipe wrenches


San Diego Specialty Works - San Diego, CA

Otto E. Hoddick
F. E. Bowen
A. Ebert O'Brien

Patent Dates:
Applied: Oct. 29, 1910
Granted: Oct. 03, 1911

Patent Pictures: [ 1 | 2 | 3 ]
W. L. Bessolo patent October 3, 1911
USPTO pdf tiff
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San Diego Specialty Works "SURE GRIP" Wrench
The action combines features of a ratchet and a chain wrench. Known examples made of metal stampings. Bessolo's financial shenanigans involving his early wrench patents were noted in a February/March 1980 American Heritage article.

The markings on the tools may be only loosely related to the patents they reflect. The wrench matching this patent can be found with a variety of markings includes dates and numbers from later Bessolo patents -- 1,008,939, 1,037,109, 1,086,127, 1,158,164, 1,318,047.

A 1913 American Machinist article describes the manufacturing process used for this wrench comprised of stamped parts.

A. J. O'Brien-patent attorney

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