USD336509SExpiredUtility

Plate valve spring

71
Assignee: COOPER IND INCPriority: Jan 4, 1990Filed: Jan 4, 1990Granted: Jun 15, 1993
Est. expiryJan 4, 2010(expired)· nominal 20-yr term from priority
Inventors:George J. SaffordGene R. Bluhm
71
PatentIndex Score
16
Cited by
10
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a plate valve spring, as shown and described.

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