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:
May. 14, 2002
Filed:
Sep. 21, 1999
Applicant:
Inventors:
Anthony Hollingsworth, Birkenau, DE;
Oliver Staudenmayer, Weinheim, DE;
Ralph Berkemann, Mörlenbach, DE;
Assignee:
Firma Carl Freudenberg, Weinheim, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 3/916 ;
U.S. Cl.
CPC ...
B01D 3/916 ;
Abstract
An air filter having a depth filter material which includes a nonwoven fabric having a upstream side and a downstream side. The nonwoven fabric is formed of adhesively and/or cohesively bonded fibers, the fibers having intertwinements which are produced by liquid-jetting from the downstream side prior to the adhesive and/or cohesive bonding, and the fibers, because of the liquid-jetting, being compacted increasingly from the upstream side toward the downstream side in such a way that differently compacted regions are formed, in which particles of different size can be separated.