Combined pressure and thermal safety valve

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Description

FIG. 1 is a perspective view taken from the front and side of a combined pressure and thermal safety valve showing my new design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image of the side shown;

FIG. 3 is a side elevational view taken 90.degree. to the side shown in FIG. 2, the opposite side being a mirror image of the side shown;

FIG. 4 is a front elevational view thereof; and

FIG. 5 is a rear elevational view thereof.

Referenced Cited
U.S. Patent Documents
D96691 August 1935 Nelson
D226431 March 1973 Emburg, Jr.
D233569 November 1974 Miller
D237360 August 1974 Watts
D242709 December 14, 1976 Schourup
D242710 December 14, 1976 Schourup
D260280 August 18, 1981 Compbell
1557250 October 1925 Grandfield
2036391 April 1936 Bradley
2722232 November 1955 Roche, Sr.
3139103 June 1964 Bottum
3368581 February 1968 Glover, Jr.
3490473 January 1970 Ehrens et al.
3556470 January 1971 Ehrens et al.
Other references
  • A sales brochure of Hydro Systems Company, 3798 Round Bottom Road, Cincinnati, Ohio, 45244, Description: A pressure relief valve characterized by the "Pump Guard.RTM." trademark, printed in 1984.
Patent History
Patent number: D321241
Type: Grant
Filed: Jun 16, 1988
Date of Patent: Oct 29, 1991
Assignee: General Pump/U.S., Inc. (Eagan, MN)
Inventor: Gary D. Ingle (Mound, MN)
Primary Examiner: James R. Largen
Law Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt
Application Number: 6/875,651
Classifications
Current U.S. Class: Pressure Regulating Or Relieving (D23/235)