USD249279SExpiredUtility

Exhaust valve of respiratory mask

85
Assignee: BACKLUND SIGURD ALFONSPriority: Sep 1, 1975Filed: Feb 12, 1976Granted: Sep 5, 1978
Est. expirySep 1, 1995(expired)· nominal 20-yr term from priority
Inventors:Sigurd Alfons Backlund
85
PatentIndex Score
36
Cited by
5
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for an exhaust valve of respiratory mask, as shown and described.

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