Patent
   D336509
Priority
Jan 04 1990
Filed
Jan 04 1990
Issued
Jun 15 1993
Expiry
Jun 15 2007
Assg.orig
Entity
unknown
13
11
n/a
The ornamental design for a plate valve spring, as shown and described.

FIG. 1 is a top plan view of a plate valve spring showing our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

Safford, George J., Bluhm, Gene R.

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Patent Priority Assignee Title
2090486,
3123095,
3428082,
3875962,
4495964, May 12 1983 Ingersoll-Rand Company Unidirectional-flow fluid valve
4627464, Dec 20 1985 Ingersoll-Rand Company Unidirectional, fluid control valve
4854341, Jul 01 1987 Hoerbiger Ventilwerke Aktiengesellschaft Plate valve
4889156, Aug 17 1987 DRESSER-RAND COMPANY, A PARTNERSHIP OF NY Compressor valve with flat spring
4913187, Aug 17 1987 DRESSER-RAND COMPANY, A PARTNERSHIP OF NY Compressor valve with flat spring
5036880, Feb 08 1990 GARDNER DENVER MACHINERY INC High efficiency plate valve for reciprocating compressor
217666,
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Jan 02 1990SAFFORD, GEORGE J Cooper Industries, IncASSIGNMENT OF ASSIGNORS INTEREST 0052100810 pdf
Jan 02 1990BLUHM, GENE R Cooper Industries, IncASSIGNMENT OF ASSIGNORS INTEREST 0052100810 pdf
Jan 04 1990Cooper Industries, Inc.(assignment on the face of the patent)
Dec 31 1993Cooper Industries, IncGARDNER DENVER MACHINERY INC ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0069370991 pdf
Mar 30 1994GARDNER DENVER MACHINERY INC NATIONSBANK OF TEXAS, NASECURITY INTEREST SEE DOCUMENT FOR DETAILS 0069240609 pdf
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