US Patent: 669,251 - Saw-sharpening machine


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US Patent: 669,251

Saw-sharpening machine

Patentees:

Henry P. Schofield (exact or similar names) - Chicago, IL

Lars Larsen Filstrup (exact or similar names) - Chicago, IL

USPTO Classifications:

474/4, 74/370, 74/380, 76/37

Tool Categories:

metalworking machines : grinders : sharpening machines : saw sharpening machines

Assignees:

None

Manufacturer:

Covel Mfg. Co. - Chicago, IL

Witnesses:

Albert D. Bacci

D. W. Lee

Patent Dates:
Applied:	Dec. 03, 1900
Granted:	Mar. 05, 1901

Patent Pictures:

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Vintage Machinery entry for Covel Mfg. Co.

Description:

In 1905 the Seventh Circuit Court of Appeals found patent 654,843, 654,844, 654,845, and 669,251, "void for lack of patentable invention in view of the prior art, in which the same devices were found in use in saw-swaging machines."