Pair of filter cartridges for a powered air-purifying respirator

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Description

FIG. 1 is a perspective view of a pair of filter cartridges for a powered air-purifying respirator, showing the new design in solid lines.

FIG. 2 is a top view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a bottom view thereof.

FIG. 7 is a rear view thereof; and,

FIG. 8 is a front view thereof, only illustrating the solid line portion of the design.

The broken line showing forms no part of the claimed design. The shading is provided only to illustrate contour; it is not indicative of texture, etc.

Claims

The ornamental design for a pair of filter cartridges for a powered air-purifying respirator.

Referenced Cited
U.S. Patent Documents
2295119 September 1942 Malcom et al.
2642061 June 1953 Boyer
4088461 May 9, 1978 Brauer
4971052 November 20, 1990 Edwards
5036844 August 6, 1991 Pouchot et al.
5086768 February 11, 1992 Niemeyer
D326540 May 26, 1992 Scholey
RE35062 October 17, 1995 Brostrom et al.
D396283 July 21, 1998 Scholey
5906203 May 25, 1999 Klockseth et al.
6055983 May 2, 2000 Metzger
D440301 April 10, 2001 Fecteau et al.
Foreign Patent Documents
3818295 July 1989 DE
0 108 560 May 1984 EP
0 164 946 December 1985 EP
0 078 110 May 1986 EP
0 352 938 October 1993 EP
572847 June 1924 FR
64-49257 March 1989 JP
WO 83/00632 March 1983 WO
WO 96/29116 September 1996 WO
Other references
  • Domestic Preparedness—Powered Air Protection for First Responders C420 Mil-Spec PAPR; SCOTT a Scott Technologies Company (dated Sep. 1999) (a four page brochure).
Patent History
Patent number: D477401
Type: Grant
Filed: Aug 3, 2000
Date of Patent: Jul 15, 2003
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Inventors: Ian T. Petherbridge (Bognor Regis), David Cook (Bracknell)
Primary Examiner: Ian Simmons
Attorney, Agent or Law Firm: Karl G Hanson
Application Number: 29/127,312
Classifications
Current U.S. Class: Mask (D24/110.1)
International Classification: 2902;