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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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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Jan 02 1990 | SAFFORD, GEORGE J | Cooper Industries, Inc | ASSIGNMENT OF ASSIGNORS INTEREST | 005210 | /0810 | |
Jan 02 1990 | BLUHM, GENE R | Cooper Industries, Inc | ASSIGNMENT OF ASSIGNORS INTEREST | 005210 | /0810 | |
Jan 04 1990 | Cooper Industries, Inc. | (assignment on the face of the patent) | / | |||
Dec 31 1993 | Cooper Industries, Inc | GARDNER DENVER MACHINERY INC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 006937 | /0991 | |
Mar 30 1994 | GARDNER DENVER MACHINERY INC | NATIONSBANK OF TEXAS, NA | SECURITY INTEREST SEE DOCUMENT FOR DETAILS | 006924 | /0609 |
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