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US Patent: 425,371
Pipe Wrench
Andrew J. Curtis - Monroe, ME

USPTO Classifications:

Tool Categories:
wrenches : pipe wrenches

Andrew J. Curtis - Monroe, ME
John H. Gordon - Brooks, ME

American Saw Co. - Trenton, NJ

J. E. Turpin
O. P. Tashiell
John R. Mason
F. M. Laughton

Patent Dates:
Applied: Mar. 05, 1889
Granted: Apr. 08, 1890

Patent Pictures: [ 1 | 2 | 3 ]
Andrew J. Curtis Pat. April 8, 1890
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The jaws are held "open" by a spring between the sliding pivot point and the adjusting bolt. The action is similar to alligator wrenches of the period. The selling point was the ability to grip at the tip of the jaws and reach into tight quarters.

Corresponding Canadian patent no. CA-36,762 (with assignment to Philo. C. Blaisdell of Carrollton, NY) was granted June 5, 1891.

Late 1890s ads showed four sizes: 9, 15, 18, and 22 inch.

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