Personal respiratory protection device having an exhalation valve

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Description

FIG. 1 is a perspective view of a personal respiratory protection device having an exhalation valve showing the new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a top elevational view thereof.

FIG. 5 is a bottom elevational view thereof; and,

FIG. 6 is a right elevational view thereof. The left side is a mirror image of the right side.

Referenced Cited
U.S. Patent Documents
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D249279 September 5, 1978 Backlund
D326541 May 26, 1992 McBrearty, Jr.
D347298 May 24, 1994 Japuntich et al.
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4248220 February 3, 1981 White
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Foreign Patent Documents
2 103 491 February 1983 GBX
Other references
  • Racal Health & Safety Product Literature for "Delta.TM. Disposable Respirators" (1993). Glendale Optical Company Product Literature for "Glendale Respiratory Protection" (Feb. 1983).
Patent History
Patent number: D431647
Type: Grant
Filed: Sep 6, 1996
Date of Patent: Oct 3, 2000
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Inventors: Christopher P. Henderson (Durham), John W. Bryant (High Shincliffe), Desmond T. Curran (Durham), James F. Dyrud (New Richmond, WI)
Primary Examiner: Ian Simmons
Attorney: Karl G. Hanson
Application Number: 0/59,264
Classifications
Current U.S. Class: D24/1101; D24/1106
International Classification: 2902;