Air duct

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Description

FIG. 1 is a perspective view, showing the new design for an air duct;

FIG. 2 is a left side view thereof, the right side view being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken line showing forms no part of the claimed design, and the shading is provided to illustrate contour only and is not an indication of texture, etc.

Claims

The ornamental design for an air duct, as shown and described.

Referenced Cited
U.S. Patent Documents
3822698 July 1974 Guy
3826255 July 1974 Havstad et al.
4136688 January 30, 1979 Gorman
4280491 July 28, 1981 Berg et al.
4462399 July 31, 1984 Braun
5054479 October 8, 1991 Yelland et al.
D350585 September 13, 1994 Rasocha
5577495 November 26, 1996 Murphy
5878742 March 9, 1999 Figueredo et al.
6014971 January 18, 2000 Danisch et al.
6250299 June 26, 2001 Danisch et al.
6279572 August 28, 2001 Danisch et al.
6810532 November 2, 2004 Wang Lee
6925655 August 9, 2005 Maki et al.
6990691 January 31, 2006 Klotz et al.
Other references
  • Photo of Airduct for 3M Powered Air Purifying Respirator.
  • Photo of Airduct for Arbin Powered Air Purifying Respirator (end view).
  • Photo of Airduct for Arbin Powered Air Purifying Respirator (side view).
  • Photo of Airduct for Martindale Powered Air Purifying Respirator.
  • Photo of Airduct for Speedglas Powered Air Purifying Respirator.
Patent History
Patent number: D529606
Type: Grant
Filed: Apr 7, 2004
Date of Patent: Oct 3, 2006
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Inventors: Paul Hind (Aycliffe), Desmond T. Curran (Durham), Peter D. Lee (Hartlepool)
Primary Examiner: Antoine D. Davis
Assistant Examiner: Christopher Lee
Attorney: Karl G. Hanson
Application Number: 29/202,969
Classifications
Current U.S. Class: Helmet Type (D24/110.3)