Plate valve spring

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Information

Patent Grant
D336509

References
Source

Patent Number
D336,509
Date Filed
Thursday, January 4, 1990
34 years ago
Date Issued
Tuesday, June 15, 1993
31 years ago

Inventors
- Gene R. Bluhm
- George J. Safford
Original Assignees
- Cooper Industries, Inc.
Examiners
- Largen; James R.
Agents
- Laff, Whitesel, Conte & Saret

US Classifications
- D23 - Environmental heating and cooling
Field of Search
- US
- D23 233-237
- D23 244-249
- 137 51613-51627
- 251 368
- Term of Grant
  14Years

Information

Abstract

Description

Claims

The ornamental design for a plate valve spring, as shown and described.

US Referenced Citations (11)

Number	Name	Date	Kind
D217666	Self	May 1970
2090486	Richardson	Aug 1937
3123095	Kohler	Mar 1964
3428082	Kohler	Feb 1969
3875962	Bauer	Apr 1975
4495964	Bennitt	Jan 1985
4627464	Hartshorn	Dec 1986
4854341	Bauer	Aug 1989
4889156	Woollatt et al.	Dec 1989
4913187	Wollatt et al.	Apr 1990
5036880	Safford et al.	Aug 1991