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US Patent: 668,645
Pipe Wrench
Ambrose Francis Jackson - Rock Island, IL

USPTO Classifications:

Tool Categories:
wrenches : pipe wrenches
wrenches : wrench adjustment types : self-adjust wrenches


W.W. Whitehead Co. - Davenport, IA
Union Tool Co. - Boston, MA

Oliver B. Moore
Hilma M. Johnson

Patent Dates:
Applied: May 31, 1900
Granted: Feb. 26, 1901

Patent Pictures: [ 1 | 2 | 3 ]
Ambrose F. Jackson patent Febr. 26, 1901
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Jackson's improvements to his June 5, 1900 patent (No. 650,974) are the connecting link and an extended lever that allows the user to retract the jaw while holding the wrench by the handle. This patent was used on the larger sizes of Jackson pipe wrenches; smaller sizes match 676,318.

Corresponding British patent GB-190104015 was registered Feb. 25, 1901.

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