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US Patent: RE13,421
Machine for Reseating Valves
Robert H. Hazeltine - New York, NY

USPTO Classifications:
451/117, 7/901

Tool Categories:
specialty tools : valve grinding tools


Not known to have been produced

M. M. Riemann
A. B. Parkam
Henry Sheldon
Herbert G. Ogden

Patent Dates:
Applied: Feb. 07, 1912
Granted: May 21, 1912

Reissue Information:
Reissue of 918,049 (Apr. 13, 1909)

Patent Pictures:
Robert E. Hazeltine patent reissue May 21, 1912
USPTO pdf tiff
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The patent describes a mechanism that combines reciprocating motion, periodic progressive motion, and periodic "lifting" motion for a valve grinder. The "holder" for the valve incorporates a magnet or electromagnet.

The reissue became the focus of a patent infringement lawsuit ( Specialty Machine Company v. Ashcroft Manufacturing Company). Ashcroft's combination drill and valve grinder was based on July 12, 1910 Blanchard patent no. 963,986.

This patent date appears in advertising for the "Sioux" valve grinders made by Albertson & Co. of Sioux City, Iowa. (see patent no. 1,282,018)

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