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US Patent: 1,174,764
Wrench
Patentee:
Frank R. Riesenberg - Chicago, IL

USPTO Classifications:
81/68

Tool Categories:
wrenches : pipe wrenches : chain and strap wrenches

Assignees:
None

Manufacturer:
Colytt Laboratories - Chicago, IL

Witnesses:
Joshua R. H. Potts
B. G. Richards
H. B. Bull

Patent Dates:
Applied: May 20, 1914
Granted: Mar. 07, 1916

Patent Pictures: [ 1 | 2 | 3 ]
Frank R. Riesenberg patent March 7, 1916
USPTO pdf tiff
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Description:
The patent is a refinement of Riesenberg's Dec. 16, 1913 patent (no. 1,081,700). The piece connecting the handle and chain is modified and the notch that holds the chain is strengthened and shaped to match the chain links. The wrench was put on the market in 1915, marked with the Dec. 16, 1913 patent.

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