Exhaust valve of respiratory mask

Skip to: Description  ·  References Cited  · Patent History  ·  Patent History
Description

FIG. 1 is a top plan view of an exhaust valve for a respiratory mask showing my new design;

FIG. 2 is a side elevation thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top perspective view of the valve guiding member shown separately for clarity of illustration;

FIG. 5 is a top perspective view of the valve flap member;

FIG. 6 is a top perspective view of the valve housing;

FIG. 7 is a top perspective view of the exhaust valve in an assembled condition.

Referenced Cited
U.S. Patent Documents
D234637 March 1975 Flynn
D243635 March 8, 1977 Miller
2828740 April 1958 Kindred
2985169 May 1961 Elling
3199524 August 1965 Mitchell
3688794 September 1972 Bird et al.
Patent History
Patent number: D249279
Type: Grant
Filed: Feb 12, 1976
Date of Patent: Sep 5, 1978
Inventor: Sigurd Alfons Backlund (SF-65230 Vassa 23)
Primary Examiner: Bernard Ansher
Attorney: Ralph E. Bucknam
Application Number: 5/657,561
Classifications
Current U.S. Class: D24/7; D23/19
International Classification: D2402; D2301;