Dust filtering respirator

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Description

FIG. 1 is a front view of our dust filtering respirator;

FIG. 2 is a rear view; and

FIG. 3 is a vertical cross section on the line 3--3 of FIG. 2.

Referenced Cited
U.S. Patent Documents
2227667 January 1941 Panethene
2382364 August 1945 Taut
2964038 December 1960 Silverman
3220409 November 1965 Liloia et al.
3490447 January 1970 Jackson
Foreign Patent Documents
1503573 October 1967 FRX
Patent History
Patent number: D271432
Type: Grant
Filed: Jun 24, 1981
Date of Patent: Nov 15, 1983
Assignee: Mine Safety Appliances Company (Pittsburgh, PA)
Inventors: Sheng-Chung Liao (Murrysville, PA), John W. Neidhart (Monroeville, PA)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Horace B. Fay, Jr.
Law Firm: Carothers & Carothers
Application Number: 6/277,062
Classifications
Current U.S. Class: D29/7
International Classification: D2902;