Breathing gas mask

- U.S.D. Corp.
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Description

FIG. 1 shows a side elevation view of my ornamental design for a breathing gas mask;

FIG. 2 shows a front elevation view of the mask;

FIG. 3 shows a rear view looking inwardly toward the mask in the direction of lines 3--3 of FIG. 1;

FIG. 4 shows a midline sectional view through the mask in the direction of lines 4--4 of FIG. 2;

FIG. 5 shows a view looking downwardly from the top of the mask; and,

FIG. 6 shows a view looking upwardly at the bottom of the mask.

Referenced Cited
U.S. Patent Documents
D137197 February 1944 DuBois
D193048 June 1962 Schwartz
D220304 March 1971 Wolfe
D249368 September 12, 1978 Watkins, Jr.
2835250 May 1958 Austin
2898908 August 1959 Sovinsky
3259127 July 1966 Klinger et al.
3343535 September 1967 Lytle et al.
3550588 December 1970 Stahl
3968793 July 13, 1976 Geissler
Foreign Patent Documents
650869 September 1937 DE2
Patent History
Patent number: D271144
Type: Grant
Filed: Jul 6, 1981
Date of Patent: Oct 25, 1983
Assignee: U.S.D. Corp. (Santa Ana, CA)
Inventor: Donald L. Gadberry (Huntington Beach, CA)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Horace B. Fay, Jr.
Attorneys: George F. Bethel, Patience K. Bethel
Application Number: 6/280,689
Classifications
Current U.S. Class: D29/9; D29/7
International Classification: D2902;