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. 29, 2000
Filed:
Aug. 27, 1998
Applicant:
Inventors:
Assignee:
Nitto Denko Corporation, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B32B / ; B32B / ; B32B / ;
U.S. Cl.
CPC ...
1563099 ; 55486 ; 55528 ; 55DI / ; 1563096 ; 156322 ; 156324 ; 264234 ; 264344 ; 264345 ; 4283166 ; 428421 ; 442397 ;
Abstract
An air filter comprising a laminate of a non-woven fabric made up of polyolefin fibers or polyester fibers or a composite of the non-woven fabrics and a PTFE porous film, wherein the amount of the total gases generated from the air filter is 20 .mu.g/g by the analysis of gas chromatography. The amount of the gases generated from the air filter is greatly reduced by heat-treating the non-woven fabric at a temperature of from 80 to 130.degree. C. for from 5 minutes to 20 minutes before or after laminating with the PTFE porous film.