USD309344SExpiredUtility

Heat exchanger

21
Individually held — no corporate assignee on recordPriority: Dec 12, 1988Filed: Dec 12, 1988Granted: Jul 17, 1990
Est. expiryDec 12, 2008(expired)· nominal 20-yr term from priority
Inventors:Herbert R. RatchMargo B. RatchDavid E. Lumbert
21
PatentIndex Score
3
Cited by
3
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a heat exchanger, as shown.

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