US Patent: 254,823 - Lifting-jack


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US Patent: 254,823

Lifting-jack

Patentees:

Charles S. Harmon (exact or similar names) - Blue Island, IL

Thomas J. Jenne (exact or similar names) - Gouverneur, NY

USPTO Classifications:

254/106

Tool Categories:

metalworking tools : lifting jacks

material handling : jacks : vehicle jacks : wagon and cart jacks

Assignees:

None

Manufacturer:

Pettibone, Mulliken & Co. - Chicago, IL

Witnesses:

Edwin B. Smith

George W. Slauford

Patent Dates:
Applied:	Jul. 29, 1881
Granted:	Mar. 14, 1882

Patent Pictures:

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Vintage Machinery entry for Pettibone, Mulliken & Co.
Pettibone, Mulliken & Company v. Stanford

Description:

Improvements to patent 245,634. An 1892 lawsuit involving this patent, Pettibone, Mulliken & Company v. Stanford, resulted in this patent being partially upheld; given the prior art the patent claims must be interpreted narrowly. Despite the patent being weak, Pettibone Mulliken & Co. manufactured "Jenne" jacks into at least the 1930s.