USD264501SExpiredUtility
Heat retrieval unit for installation into a flue duct
Individually held — no corporate assignee on recordPriority: Oct 22, 1979Filed: Oct 22, 1979Granted: May 18, 1982
Est. expiryOct 22, 1999(expired)· nominal 20-yr term from priority
Inventors:Darrow R. Beaton
36
PatentIndex Score
3
Cited by
7
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for a heat retrieval unit for installation into a flue duct, as shown.
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