Air duct riser

- General Plastics, Inc.
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Description

FIG. 1 is a top plan view of an air duct riser which incorporates our new design;

FIG. 2 is a side elevation view of the air duct riser;

FIG. 3 is a front elevation view of the air duct riser; and,

FIG. 4 is a perspective view of the air duct riser.

The rear of the air duct riser is a mirror image of the front, and the bottom is a mirror image of the top.

Referenced Cited
U.S. Patent Documents
24660 July 1859 Potts
D314820 February 19, 1991 Sullivan
567231 September 1896 Glauber
925762 June 1909 Eager
2086007 July 1937 Tompkins
2215318 September 1940 Bristol
4773197 September 27, 1988 Sullivan
Other references
  • Exhibit A--Photograph of prior air duct riser. Exhibit B--Photograph of prior air duct riser. Sales information from Northern Pipe Products and GPK Products, Inc. (Undated but believed to be prior art to the present application).
Patent History
Patent number: D341655
Type: Grant
Filed: Feb 5, 1993
Date of Patent: Nov 23, 1993
Assignee: General Plastics, Inc. (Shawnee, OK)
Inventors: John P. Inda (Shawnee, OK), Joseph J. Inda (Tecumseh, OK)
Primary Examiner: Wallace R. Burke
Assistant Examiner: Lisa Lichtenstein
Law Firm: Dougherty, Hessin, Beavers & Gilbert
Application Number: 0/4,468
Classifications
Current U.S. Class: Vent, Ductwork, Or Element Thereof (D23/393)