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US Patent: 773,773
Chain Pipe-Wrench
George Amborn - New York, NY
Herbert C. Chase - New York, NY

USPTO Classifications:

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

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

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

H. J. Austin
William J. Tinkler
Mortimer J. Travis
William H. Anderson, Jr.

Patent Dates:
Applied: Apr. 19, 1904
Granted: Nov. 01, 1904

Patent Pictures:
George Amborn and Herbert C. Chase patent November 1, 1904
USPTO pdf tiff
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Improvement to George Amborn, Jr. patent no. 698,780. The parts are reconfigured to improve the wrench's ability to work in tight quarters. The chain's attachment to the head is to follow Bufford's November 3, 1903 patent (no. 743,058). Patent no. 769,043 is another stage in the evolution of the design.

Compare British patent GB-190423580 registered Nov. 1, 1904.

Williams produced chain wrenches of this sort for work with fittings, pipe nipples, etc. under the trade name "AGRIPPA."

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