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:
Dec. 03, 2002
Filed:
Mar. 16, 2001
Wolfram Schultheiss, Weinheim, DE;
Felix Herberg, Heppenheim, DE;
Jörg Stöckler, Zürich, CH;
Firma Carl Freudenberg, Weinheim, DE;
Abstract
The present invention relates to a pleated filter made of a multi-layer filter medium, including at least one filter paper layer having area weights of 30-100 g/m , a microfiber nonwoven fabric layer having area weights 5-120 g/m and a support nonwoven fabric layer made of synthetic, polymeric fibers having area weights of 10-120 g/m . The layers of the pleated filter contain fused polymer areas by which the fabric layers are bonded to the paper layer, and by which the fabric layers are made firmer within themselves. When subject to a fractional efficiency test at an initial pressure difference of at most 180 Pa, at a boundary speed of approximately 2.62 m/s and a flow speed through the filter medium of approximately 0.13 m/s, the pleated filter is able to separate at least 90% of particles greater than 0.3 &mgr;m, at least 92% of particles greater than 0.5 &mgr;m, at least 93% of particles greater than 1 &mgr;m, and at least 97% of particles greater than 3 &mgr;m, as measured using the standard method DIN EN 60312 (IEC 60312) § 5.1.2.5.