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US Patent: 3,304,817
Wrench with Concave Jaw Teeth
John E. Swanstrom, Jr. - Duluth, MN
Swan Elmer Swanson - Duluth, MN

USPTO Classifications:
81/65.2, 81/68

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

Diamond Tool & Horseshoe Co. - Duluth, MN

Diamond Tool & Horseshoe Co. - Duluth, MN

none listed

Patent Dates:
Applied: Feb. 26, 1965
Granted: Feb. 21, 1967

Patent Pictures: [ 1 | 2 ]
John E. Swanstrom, Jr. and S. Elmer Swanson patent February 21, 1967
USPTO pdf tiff
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The patented features include technical details of the shape of the face which facilitate sharpening, as the main wear points on the teeth are the outer edges of the jaws.

Known examples with the patent number include "Diamalloy Diamond Tool and Horseshoe Co. Duluth, U.S.A."

Patent nos. 514,721, 722,144, 944,468, 1,522,804, 1,824,944 and 2,795,986 are listed as references.

Schroeder, Siegfried & Ryan - patent attorneys

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