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. 29, 1988
Filed:
Apr. 21, 1987
Applicant:
Inventors:
Eberhard Janssen, Duren-Echtz, DE;
Willi Hunold, Merzenich, DE;
Assignee:
Thomas Josef Heimbach GmbH & Co., Dueren, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428234 ; 427365 ; 427366 ; 427412 ; 4273899 ; 427394 ; 428235 ; 428300 ; 428301 ; 4283111 ; 4283179 ;
Abstract
A filter fabric comprises a needle felt substrate comprised of a non-woven air permeable fabric having spaced surfaces. An open pour air permeable plastic foam is incorporated into the substrate and extends from one surface toward the other.