US Patent: 411,845 - Drill-grinding machine


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US Patent: 411,845

Drill-grinding machine

Patentee:

Oakley S. Walker (exact or similar names) - Worcester, MA

USPTO Classifications:

451/380

Tool Categories:

metalworking machines : grinders : drill grinders

metalworking machines : grinders : sharpening machines : drill sharpening machines

Assignees:

None

Manufacturer:

O. S. Walker & Co. - Worcester, MA

Witnesses:

F. E. Knight

W. H. Oakes

Patent Dates:
Applied:	Dec. 23, 1887
Granted:	Oct. 01, 1889

Patent Pictures:

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Vintage Machinery entry for O. S. Walker & Co.
Eames et. al. v. WPI

Description:

This patent date was seen on a "Worcester" twist-drill grinder from O. S. Walker & Co.

This and patent 425,839 were subject of a lawsuit, Eames et. al. v. Worcester Polytechnic Institute; in that suit this patent (411,845) was found to be void for lack of invention in view of the prior art; claims 1 and 2 of 425,839 were held to be invalid, and claim 1 was held to be infringed. The two Walker patents were assigned to the complainant Eames,