US Patent: 1,258,628


	Home\| FAQ	Search:Advanced\|Person\|Company\| Type\|Class	Login


Quick search:	Patent number:	Patent Date:

Wrench

Patentee:

Arthur James Whitfield (exact or similar names) - Boston, MA

USPTO Classifications:

81/105

Tool Categories:

wrenches : pipe wrenches

Assignees:

Trimont Manufacturing Company - Boston, MA

Manufacturer:

Trimont Manufacturing Company - Boston, MA

Witnesses:

William T. H. Salter

Charles C. Ely

Patent Dates:
Applied:	Apr. 23, 1917
Granted:	Mar. 05, 1918

Patent Pictures:

Arthur James Whitfield patent March 5, 1918 with 24 inch TRIMO pat 3-5-18 -- Doug Busch collection

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Stan Schulz

Description:

The patent is an improvement to Whitfield's June 20, 1916 patent (no. 1,187,690). The bearing surfaces of the frame holding the movable jaw and the abutment on the handle are modified to discourage "spreading" of that portion of the frame.

TRIMO pipe wrenches were produced marked with this patent date.