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US Patent: 250,641
Chain Wrench
William H. Brock - Corona, NY

USPTO Classifications:

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


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

Samuel J. Cohen
Roswell W. Keene
Pierre F. Spencer

Patent Dates:
Applied: Nov. 02, 1881
Granted: Dec. 13, 1881

Patent Pictures:
William H. Brock patented Dec. 13, 1881
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The patent adds the interior lugs on the toothed side plates to the features in Brock's October 4, 1881 patent (no. 247,987). Brock began manufacture of chain tongs in 1882.

This is one of the earliest patents in the evolution of J.H. Williams VULCAN chain pipe wrenches. After selling his early patents to J.H. Williams, Brock developed a different design which he later manufactured.

Other Brock chain wrench patents include nos. 254,862, 298,442, 366,451, 389,685, 483,419.

Alexander N. Wright - patent attorney

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