USD312684SExpiredUtility

Parabolic electric heater

69
Assignee: NAT PRESTO INDUSTRIES INCPriority: Oct 7, 1988Filed: Oct 7, 1988Granted: Dec 4, 1990
Est. expiryOct 7, 2008(expired)· nominal 20-yr term from priority
Inventors:Richard L. GeisslerRoger L. Kelly
69
PatentIndex Score
12
Cited by
30
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a parabolic electric heater, as shown and described.

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