USD271238SExpiredUtility
Passive heat exchanger
Individually held — no corporate assignee on recordPriority: Aug 13, 1981Filed: Aug 13, 1981Granted: Nov 1, 1983
Est. expiryAug 13, 2001(expired)· nominal 20-yr term from priority
Inventors:Benjamin L. Valencia
18
PatentIndex Score
2
Cited by
1
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for a passive heat exchanger, as shown and described.
Join the waitlist — get patent alerts
Track USD271238S — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.