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US Patent: 2,598,650
Snap Lock Plier With Unlocking Lever
Justin L. Smith - Watertown, CT
Leif H. Eriksen - Oslo, Norway

USPTO Classifications:
81/369, 81/380, 81/399

Tool Categories:
wrenches : pliers type wrenches : locking pliers

Seymour Smith and Son, Inc. - Oakville, CT

Seymour Smith and Son, Inc. - Oakville, CT


Patent Dates:
Applied: Jul. 28, 1948
Granted: May 27, 1952

Patent Pictures:
Justin L. Smith and Leif H. Eriksen patent May 27, 1952
USPTO pdf tiff
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The primary features of the patent are the unlocking lever, and the size scale stamped on the frame. Although not mentioned in the specifications, it is an improvement to patent no. 2,478,696.

The specifications cite patent nos. 578,249, 1,852,075, 2,252,798, 2,385,654, 2,443,153, 2,462,709, 2,489,895, 2,500,261, 2,514,130, 2,519,973, and 2,523,385 as references.

Many known examples marked SEYMOUR SMITH SNAP LOCK PAT PEND. The company appears in the 1953 THOMAS REGISTER.

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