USD316142SExpiredUtility

Air purification unit

44
Assignee: CONTROL RESOURCE SYSTEMS INCPriority: Feb 15, 1989Filed: Feb 15, 1989Granted: Apr 9, 1991
Est. expiryFeb 15, 2009(expired)· nominal 20-yr term from priority
Inventors:Rickey S. LutterbachJeffrey A. Granacki
44
PatentIndex Score
5
Cited by
2
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for an air purification unit, as shown and described.

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