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Title:
Extension for a heating duct
United States Patent D471972
Representative Image:
Extension for a heating duct
Inventors:
Hebert, Murray A. (Baxter, MN)
Application Number:
D/151503
Publication Date:
03/18/2003
Filing Date:
11/07/2001
Primary Class:
Field of Search:
D23/387-389, D23/421, 454/237, 416/244R, 72/86, 52/95, 329/347, 454/275-276, 72/80, 285/924, 329/365-369, 72/82-84, 285/405, 52/302.3, 72/67, 285/425, D23/499, D23/386, 285/3, 454/250, D23/391-394
View Patent Images:
US Patent References:
5240288Double air duct bootInda et al.
5080403Apparatus for connecting a branch duct to another ductPaoluccio
5036636Multiple size vent-pipe roof flashingHasty
4773197Air duct bootSullivan
4750411Register box and wyeEversole
4491349Y-Connection for flexible conduitRice et al.
4067353Pipeline tap and connecting deviceDeHoff
3645566SADDLE-TYPE TEE CONNECTORDyek
3610288COMBINED PIPE CONNECTOR AND PIPE CAPCarr et al.
2563578N/ACandee285/405X
2215318Air ductBristol
2086007Sheet metal bootTompkins
1908821Branch-fitting for pipesCornell, Jr.
0925762N/AEager
0567231N/AGlauber
0024660N/APotts
D298276Combined mounting frame and duct for an air conditioner unitButcherD23/354
D314820Air duct bootSullivan
D451589Turning ends for heat exchangersAxelssonD23/387
Foreign References:
GB871635
Primary Examiner:
Zarfas, Louis S.
Assistant Examiner:
Delehanty, Robert A.
Attorney, Agent or Firm:
Helget, Gerald E.
Capes, Nelson R.
Briggs, And Morgan
Claims:
1. The ornamental design for an extension for a heating duct, as shown and described.

Description:
FIG. 1 is a perspective view showing my new design for an extension for a heating duct;

FIG. 2 is a left side elevation view which is a mirror image of the right side elevation view;

FIG. 3 is a bottom plan view;

FIG. 4 is a front elevation view which is a mirror image of the rear elevation view; and,

FIG. 5 is a top plan view.