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US Patent: 1,389,581
Charles A. Dies - Chicago, IL

USPTO Classifications:
81/102, 81/105

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : screw adjust wrenches

John V. Larson - Chicago, IL

LARCO Wrench and Manufacturing Co. - Chicago, IL

John Enders

Patent Dates:
Applied: Mar. 27, 1919
Granted: Sep. 06, 1921

Patent Pictures:
Charles A. Dies patent September 6, 1921
USPTO pdf tiff
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The focus of the patent is the "guide housing" / "adjusting screw sleeve" for a wrench of the type described in Dies' Sept. 28, 1918 patent (no. 1,155,136). The wrench frame was produced with pipe gripping jaws and as a smooth-jawed nut wrench. They were announced to the trade in 1921.

Robert Burns, patent attorney

This patent was cited as prior art in patent no. 2,555,395.

Patent application renewed Feb. 8, 1921

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