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US Patent: 769,043
Chain Wrench
Patentee:
George Amborn - Brooklyn, NY

USPTO Classifications:
81/70

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

Assignees:
J. H. Williams & Co. - Brooklyn, NY

Manufacturer:
Not known to have been produced

Witnesses:
Mortimer J. Travis
James H. San Jule
H. S. Austin
Lawrence A. Janney

Patent Dates:
Applied: Jul. 18, 1904
Granted: Aug. 30, 1904

Patent Pictures:
George Amborn patent August 30, 1904
USPTO pdf tiff
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Description:
"Single jaw" chain wrench - in the "ancestry" of the AGRIPPA pipe and fittings chain wrench. The specifications describe the side catches for the chain in the context of Booth and Redfield's June 13, 1893 patent no. 499,508 and Bufford's Nov. 3, 1903 patent no. 743,058. Patent no. 773,773 represents a further stage in evolution of the design.

Arthur S. Browne - patent attorney

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