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:
Nov. 30, 1982
Filed:
May. 20, 1981
Applicant:
Inventors:
Herman H Forsten, Hockessin, DE (US);
Peter E Frankenburg, Wilmington, DE (US);
Jagdish N Shah, Wilmington, DE (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ; B32B / ; D04H / ;
U.S. Cl.
CPC ...
428234 ; 28112 ; 55528 ; 55DI / ; 210505 ; 428280 ; 428282 ; 428285 ; 428286 ; 428297 ; 428300 ; 428359 ;
Abstract
65-99 percent by weight poly(tetrafluoroethylene) fibers and 1-35 percent by weight glass fibers are combined in an intimate blend suitable for the preparation of filter felts having reduced leakage while maintaining high permeability to gas flow.