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US Patent: 3,192,804
Chain Clamps
Chain Pipe Wrench.
Christian Petersen - DeWitt, NE
William L. Becker - Denver, CO
Emil A. Allemeier - Spencerville, OH

USPTO Classifications:
81/370, 81/65.2

Tool Categories:
wrenches : pliers type wrenches : locking pliers
wrenches : pipe wrenches : chain and strap wrenches

Petersen Manufacturing Co., Inc. - DeWitt, NE

Petersen Manufacturing Co., Inc. - DeWitt, NE

none listed

Patent Dates:
Applied: Sep. 20, 1962
Granted: Jul. 06, 1965

Patent Pictures: [ 1 | 2 ]
C. Petersen, W.L. Becker, and E.A. Allemeier patent July 6, 1965
USPTO pdf tiff
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The chain wrench version of the Vise-Grip® locking plier wrench. The first page of the patent drawings is illegible in the patent office's on-line database. The patent includes a couple of alternate forms. The specifications cite the April 8, 1924 Petersen patent no. 1,489,458.

The lever handle on the example shown in photo 2 is marked U.S. PAT NO. 2,280,005 U.S. PAT No. 2,514,130 OTHER PAT. PEND.

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