Environmental heating and cooling; fluid handling and sanitary e – Heating or cooling – Element or attachment – not elsewhere specified
Patent
1999-03-22
2000-04-25
Siegel, Mitchell
Environmental heating and cooling; fluid handling and sanitary e
Heating or cooling
Element or attachment, not elsewhere specified
2399
Patent
active
D04236602
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Exhibit A--Photograph of prior air duct riser.
Exhibit B--Photograph of prior art 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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