Extension for a heating duct

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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.

Claims

The ornamental design for an extension for a heating duct, as shown and described.

Referenced Cited
U.S. Patent Documents
24660 July 1859 Potts
567231 September 1896 Glauber
925762 June 1909 Eager
1908821 May 1933 Cornell, Jr.
2086007 July 1937 Tompkins
2215318 September 1940 Bristol
2563578 August 1951 Candee
3610288 October 1971 Carr et al.
3645566 February 1972 Dyek
4067353 January 10, 1978 DeHoff
4491349 January 1, 1985 Rice et al.
4750411 June 14, 1988 Eversole
4773197 September 27, 1988 Sullivan
D298276 October 25, 1988 Butcher
D314820 February 19, 1991 Sullivan
5036636 August 6, 1991 Hasty
5080403 January 14, 1992 Paoluccio
5240288 August 31, 1993 Inda et al.
D451589 December 4, 2001 Axelsson
Foreign Patent Documents
871635 June 1961 GB
Patent History
Patent number: D471972
Type: Grant
Filed: Nov 7, 2001
Date of Patent: Mar 18, 2003
Inventor: Murray A. Hebert (Baxter, MN)
Primary Examiner: Louis S. Zarfas
Assistant Examiner: Robert A. Delehanty
Attorney, Agent or Law Firms: Gerald E. Helget, Nelson R. Capes, Briggs and Morgan
Application Number: 29/151,503
Classifications
Current U.S. Class: Vent, Ductwork, Or Element Thereof (D23/393)
International Classification: 2303;