USD316447SExpiredUtility

Negative pressure air filtration housing

68
Assignee: CRITICAL IND INCPriority: Sep 19, 1989Filed: Sep 19, 1989Granted: Apr 23, 1991
Est. expirySep 19, 2009(expired)· nominal 20-yr term from priority
Inventors:James C. WoodsonRon W. MumfordKenneth S. Kondo
68
PatentIndex Score
20
Cited by
3
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a negative pressure air filtration housing, as shown.

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