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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.:

US 9289713 B1

PDFFull Text
Date of Patent:
Mar. 22, 2016

Filed:

Feb. 18, 2013

Blended nonwoven fabric, filter medium, and filter unit

Applicant:

Nitto Denko Corporation, Ibaraki-shi, Osaka, JP;

Inventors:

Shiho Uchiyama, Osaka, JP;

Yuri Horie, Osaka, JP;

Masahiro Arai, Osaka, JP;

Masaaki Mori, Osaka, JP;

Tetsuo Asano, Gifu, JP;

Nobuhiro Matsunaga, Gifu, JP;

Assignee:

Nitto Denko Corporation, Osaka, JP;

Attorney:

Hamre, Schumann, Mueller & Larson, P.C.

Primary Examiner:

Amber R Orlando

Assistant Examiner:

Britanny Precht

Int. Cl.
CPC ...
B01D 39/16 (2006.01); B01D 46/54 (2006.01); D04H 1/541 (2012.01); B01D 69/10 (2006.01); B01D 71/26 (2006.01); B01D 71/36 (2006.01); B01D 71/48 (2006.01); B32B 27/12 (2006.01); B32B 27/30 (2006.01); D01F 8/06 (2006.01); D01F 8/14 (2006.01); B01D 53/22 (2006.01); D04H 3/147 (2012.01); B32B 5/02 (2006.01); B32B 5/08 (2006.01); B32B 27/32 (2006.01);
U.S. Cl.
CPC ...
B01D 46/543 (2013.01); B01D 39/16 (2013.01); B01D 39/163 (2013.01); B01D 39/1692 (2013.01); B01D 53/228 (2013.01); B01D 69/10 (2013.01); B01D 71/26 (2013.01); B01D 71/36 (2013.01); B01D 71/48 (2013.01); B32B 5/022 (2013.01); B32B 5/08 (2013.01); B32B 27/12 (2013.01); B32B 27/30 (2013.01); B32B 27/322 (2013.01); D01F 8/06 (2013.01); D01F 8/14 (2013.01); D04H 1/541 (2013.01); D04H 3/147 (2013.01); B01D 2239/0216 (2013.01); B01D 2239/0233 (2013.01); B01D 2239/064 (2013.01); B01D 2239/065 (2013.01); B01D 2239/0636 (2013.01); B32B 2262/0253 (2013.01); B32B 2262/0276 (2013.01); B32B 2262/0284 (2013.01); B32B 2262/12 (2013.01); B32B 2262/14 (2013.01); B32B 2307/4026 (2013.01); B32B 2307/7145 (2013.01); B32B 2307/724 (2013.01); D10B 2331/04 (2013.01); D10B 2505/04 (2013.01); Y10T 442/608 (2015.04); Y10T 442/641 (2015.04);
Abstract

The present invention provides a filter medium causing a low pressure drop. The present invention is a filter medium including a porous fluororesin membrane and an air-permeable support member laminated on at least one surface of the porous fluororesin membrane. In this filter medium, the air-permeable support member is a blended nonwoven fabric containing: core-sheath fibers (A) having a polyester core and a polyolefin sheath; polyester fibers (B); and core-sheath fibers (C) having a polyester core and a copolymerized polyester sheath.

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