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US Patent: 918,049
Machine for Reseating Valves
Robert H. Hazeltine - Ithaca, Tompkins County, NY

USPTO Classifications:
451/117, 7/901

Tool Categories:
specialty tools : valve grinding tools


Not known to have been produced

Chas. H. Hughes
H. E. Chase
C. M. McCormack
M. M. Riemann

Patent Dates:
Applied: Mar. 26, 1907
Granted: Apr. 13, 1909

Reissue Information:
Reissued as RE13,421 (May 21, 1912)

Patent Pictures:
Robert H. Hazeltine patent April 13, 1909
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.

Reissued. The patent was the subject of a lawsuit (Specialty Machine Company vs. Ashcroft Manufacturing Company ) in which one of the issues was the ability of a patent applicant to "revise" claims during the process of applying for a reissue. For the Ashscroft grinder, see pat. no. 963,986.

This patent date appears in advertising for the "Sioux" valve grinders made by Albertson & Co. of Sioux City, Iowa. (see Hazeltine's parallel patent no. 918,050 and patent no. 1,282,018).

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