USD319499SExpiredUtility
Air exchange ventilation unit
Individually held — no corporate assignee on recordPriority: Jun 15, 1990Filed: Jun 15, 1990Granted: Aug 27, 1991
Est. expiryJun 15, 2010(expired)· nominal 20-yr term from priority
Inventors:Stephen W. Hague
74
PatentIndex Score
26
Cited by
2
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for an air exchange ventilation unit, as shown and described.
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