Combined respirator face piece and strap units

- U.S.D. Corp.
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Description

FIG. 1 is a front view of a combined respirator face piece and strap units showing our new design with a pair of detachable filter units being shown in broken lines spaced apart from each side of the face piece for illustrative environmental purposes only;

FIG. 2 is a side elevation view in the direction of lines 2--2 of FIG. 1 which symmetrical to the other side of the face piece;

FIG. 3 shows a sectional view through lines 3--3 of FIG. 1;

FIG. 4 shows a rear view opposite from the showing of FIG. 1;

FIG. 5 shows a sectional view through lines 5--5 of FIG. 1;

FIG. 6 shows a bottom view looking upwardly in the direction of lines 6--6 of FIG. 1; and,

FIG. 7 shows a view looking downwardly in the direction of lines 7--7 of FIG. 1

Portions of the straps are shown fragmentally in FIGS. 1 and 2, and display of the straps as omitted altogether in FIGS. 3-7, for ease of illustration .

Referenced Cited
U.S. Patent Documents
D190705 June 1961 Gongoll
2166164 July 1939 Lehmbon g
2327995 August 1943 Bulbulian
2341566 February 1944 Monro
2344669 March 1944 Barken et al.
2652828 September 1953 Matheson
2744525 May 1956 Whipple
2823671 February 1958 Ganelick
2858828 November 1958 Matheson
2939458 June 1960 Lundquist
2999498 September 1961 Matheson
Patent History
Patent number: D271246
Type: Grant
Filed: Mar 2, 1981
Date of Patent: Nov 1, 1983
Assignee: U.S.D. Corp. (Santa Ana, CA)
Inventors: James N. Matheson (Mission Viejo, CA), Philip L. Lowry (Costa Mesa, CA)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Horace B. Fay, Jr.
Attorneys: George F. Bethel, Patience K. Bethel
Application Number: 6/239,693
Classifications
Current U.S. Class: D29/7
International Classification: D2902;