Air duct riser

Details Air duct riser Air duct riser

1993-02-05

1993-11-23

Burke, Wallace R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

Patent

active

D03416550

REFERENCES:
patent: 24660 (1859-07-01), Potts
patent: D314820 (1991-02-01), Sullivan
patent: 567231 (1896-09-01), Glauber
patent: 925762 (1909-06-01), Eager
patent: 2086007 (1937-07-01), Tompkins
patent: 2215318 (1940-09-01), Bristol
patent: 4773197 (1988-09-01), Sullivan
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).

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