Breathing mask

- Chemetron Corporation
Description

FIG. 1 is a perspective view of a breathing mask showing our new design;

FIG. 2 is a left side elevation thereof;

FIG. 3 is a rear perspective view thereof,

FIG. 4 is a bottom perspective view thereof; and

FIG. 5 is a right side elevation of a modified embodiment of the mask illustrated in FIG. 1.

The broken lines representing the human form is shown for illustrative purposes only.

Referenced Cited
U.S. Patent Documents
D197450 February 1964 Grimm
D197451 February 1964 Grimm
D209884 January 1968 Hansford, Jr.
D225582 December 1972 King
2540567 February 1951 Bennett
2843121 July 1958 Hudson
3802431 April 1974 Farr
Patent History
Patent number: D250131
Type: Grant
Filed: Oct 18, 1976
Date of Patent: Oct 31, 1978
Assignee: Chemetron Corporation (Chicago, IL)
Inventors: George T. Lewis (Fallbrook, CA), John H. Price (La Jolla, CA)
Primary Examiner: Bernard Ansher
Attorney: Nicholas M. Esser
Application Number: 5/733,571
Classifications
Current U.S. Class: Powder Type (13) (D28/8); 128/1467
International Classification: D2902; D2402;