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:
Aug. 09, 2022
Filed:
Sep. 25, 2017
Applicant:
Nitto Denko Corporation, Osaka, JP;
Inventors:
Takashi Niki, Osaka, JP;
Masaaki Mori, Osaka, JP;
Shiho Wada, Osaka, JP;
Atsushi Daimon, Osaka, JP;
Toshiki Yanagi, Osaka, JP;
Assignee:
NITTO DENKO CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 46/54 (2006.01); B01D 46/52 (2006.01); B32B 27/12 (2006.01); B32B 27/08 (2006.01); B01D 39/16 (2006.01); B32B 3/28 (2006.01); B32B 5/02 (2006.01); B32B 27/32 (2006.01); B01D 71/36 (2006.01); B01D 63/14 (2006.01); B32B 5/28 (2006.01); B32B 27/30 (2006.01);
U.S. Cl.
CPC ...
B01D 46/543 (2013.01); B01D 39/16 (2013.01); B01D 39/1692 (2013.01); B01D 46/52 (2013.01); B01D 46/521 (2013.01); B01D 63/14 (2013.01); B01D 71/36 (2013.01); B32B 3/28 (2013.01); B32B 5/022 (2013.01); B32B 5/28 (2013.01); B32B 27/08 (2013.01); B32B 27/12 (2013.01); B32B 27/30 (2013.01); B32B 27/322 (2013.01); B01D 2239/065 (2013.01); B01D 2239/0618 (2013.01); B01D 2275/10 (2013.01); B32B 2307/724 (2013.01);
Abstract
An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A contact angle of the first porous PTFE membrane with water is in the range of 154° to 165°.