Protective respiratory helmet with rear recess design

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Description

FIG. 1 is a perspective view of a protective respiratory helmet with rear recess design showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is bottom plan view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a left side elevational view thereof, the right side view being the mirror image.

The portion of the drawings shown in phantom is for illustrative purposes only and is not intended to form part of the claimed design.

A rear view has been excluded because it would not be illustrative of the claimed ornamental design.

Referenced Cited
U.S. Patent Documents
D190220 May 1961 Clohesy
D192071 January 1962 Tucker
D216765 March 1970 DalPiaz
D240310 June 1976 Sinclair
D277425 February 5, 1985 Higginson
D299765 February 7, 1989 Lewis et al.
D370308 May 28, 1996 Nilsson
D375826 November 26, 1996 Summers
Other references
  • Product Information: "Pureflo Powered Respirators," Helmet Integrated Systems Ltd., 13 pages. Product information: "Cobra Powered Helmet Respirators," MSA. Product Information: "AH29 Air Supplied Airstream," Airstream Anti Dust Helmet, Racal. Product Information: "The Dustmaster System," Arco. Product Information: "Breathe Easy Plus," 1 BE1+ Helmet System, Racal. Product Information: Helmet product literature, Kasco, 7 pages.
Patent History
Patent number: D421820
Type: Grant
Filed: Mar 10, 1998
Date of Patent: Mar 21, 2000
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Inventor: Brett R. Johnson (St. Paul, MN)
Primary Examiner: Ruth McInroy
Attorney: James A. Rogers
Application Number: 0/84,759
Classifications
Current U.S. Class: Element Or Attachment (D29/122); Cranial (D29/102)
International Classification: 2902;