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US Patent: 918,050
Valve Grinding Device
Robert H. Hazeltine - New York, NY

USPTO Classifications:
451/117, 74/320, 74/79

Tool Categories:
specialty tools : valve grinding tools


Specialty Machine Company - New York, NY

E. P. LaGay
Herbert G. Ogden
Geo. A. Hoffman

Patent Dates:
Applied: Mar. 23, 1908
Granted: Apr. 13, 1909

Patent Pictures:
Robert H. Hazeltine patent April 13, 1909
USPTO pdf tiff
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Specialty Machine Co. Automatic Valve Grinder ca. 1912 (FLICKR)
The patent claim is the combination of reciprocating rotation combined with progressive rotation, so that valve grinding is uniform around the valve circumference.

This patent date was later cited as the earliest of several patents used in the Sioux line of valve grinders produced by Albertson & Company of Sioux City, IA. (See also Hazeltine's parallel patent no. 918,049.

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