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US Patent: 1,392,443
William Petersen - DeWitt, NE

USPTO Classifications:
81/111, 81/177.1

Tool Categories:
wrenches : pliers type wrenches : locking pliers


Petersen Mfg. Co. - DeWitt, NE
S. P. W. Co. - DeWitt, NE

none listed

Patent Dates:
Applied: Feb. 26, 1921
Granted: Oct. 04, 1921

Patent Pictures: [ 1 | 2 ]
William Petersen patent Oct. 4, 1921, with example of the tool and detail of adjusting screw
USPTO pdf tiff
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The 75TH Anniversary of the Vise-Grip® Locking Pliers
The "1st Model" was produced for a few years at DeWitt using forged pieces manufactured at Cicero, Illinois. It does not have the locking lever, which was added in 1924 with patent No. 1,489,458. The phrase "vise-gripping action" appears in the second paragraph of the specifications.

Some examples are stamped S.P.W. Co on one side - an apparent reference to a short-lived partnership between Petersen and Jules A. Sire, a local banker who appears as assignee of one-half interest of Petersen's April 8, 1924 patent no 1,489,458.

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