The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 1992
Filed:
Jun. 27, 1990
Applicant:
Inventors:
Andrew Popelka, Acton, MA (US);
Paul H Sarkisian, Watertown, MA (US);
Assignee:
Electric Power Research Institute, , CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16L / ;
U.S. Cl.
CPC ...
138119 ; 138121 ; 138128 ; 138157 ; 138173 ;
Abstract
A rectangular, flexible duct serves as an alternative to galvanized sheet metal duct work installed in homes by utilizing corrugated semi-rigid top and bottom walls with relatively flexible connecting side walls so that the duct may be easily rolled and stored. But when unrolled, it is fastened, for example, between floor joists of a home by use of an overhanging flange formed by one of the top or bottom walls. The duct walls are made of heat resistant plastic suitable for heating and ventilating. Rigidity is provided in the top and bottom walls by corrugations or ribs formed in the plastic.