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:
Apr. 29, 2014
Filed:
Dec. 03, 2007
Klauss Veeser, Weinheim, DE;
Armin Greiner, Weinheim, DE;
Harold Von Schischka, Oestringen, DE;
Juergen Adolph, Stockstadt, DE;
Toan-hieu Giang, Viernheim, DE;
Klauss Veeser, Weinheim, DE;
Armin Greiner, Weinheim, DE;
Harold Von Schischka, Oestringen, DE;
Juergen Adolph, Stockstadt, DE;
Toan-Hieu Giang, Viernheim, DE;
Carl Freudenberg KG, Weinheim, DE;
Abstract
A layer for use in a HEPA filter element solves the problem of disclosing a filter element which satisfies HEPA requirements. Said layer comprises a first support layer () for stabilization which contains polypropylene fibers, and a second deposition layer () which contains polypropylene fibers, wherein the polypropylene fibers of the deposition layer () are at least partially electrostatically charged, and wherein the support layer () and the deposition layer () are constructed as nonwoven material which is at least partially free of glass fiber. The layer according to the invention can be easily pleated while having excellent filter efficiency.