US Patent: 70,788 - Improvement in grinding machine for circular saws


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US Patent: 70,788

Improvement in grinding machine for circular saws

Patentees:

Adam Sowden (exact or similar names) - Cincinnati, OH

Thomas Birch (exact or similar names) - Covington, KY

USPTO Classifications:

451/189, 451/221, 451/258, 451/397

Tool Categories:

tool making : making sawblades

Assignees:

Ritter, Hogan & Sowden - Cincinnati, OH

Manufacturer:

Not known to have been produced

Witnesses:

James H. Layman

George H. Knight

Patent Dates:
Granted:	Nov. 12, 1867

Patent Pictures:

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Description:

"Our invention relates to a device for grinding circular saws to a uniform thickness and true plane..." The firm of Ritter, Hogan & Sowden manufactured saws, especially circular saws. So far as we can tell this machine was not manufactured but was for their own use.