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US Patent: 2,190,081
Edward M. Pfauser - Elm Grove, WI

USPTO Classifications:
403/328, 403/361, 81/177.85

Tool Categories:
wrenches : wrench components

Blackhawk Mfg. Co. - Milwaukee, WI

Blackhawk Mfg. Co. - Milwaukee, WI

none listed

Patent Dates:
Applied: Jan. 22, 1936
Granted: Feb. 13, 1940

Patent Pictures:
Edward M. Pfauser patent February 13, 1940
USPTO pdf tiff
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Alloy Artifacts describes this patent as the culmination of a series of patents used for Blackhawk's "Lock-On" drive tools and sockets. This patent shows the release button in the sockets.

Alloy Artifacts describes the patent sequence as: 1,685,503, RE19,287, 1,807,134, 1,927,844, 1,982,008 and this patent.

Morsell, Lieber & Morsell - patent attorneys

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