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:
Jul. 18, 2023
Filed:
Jul. 02, 2021
Applicant:
Nitto Denko Corporation, Osaka, JP;
Inventors:
Yu Kamamoto, Osaka, JP;
Hisae Kitagawa, Osaka, JP;
Assignee:
NITTO DENKO CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J 9/14 (2006.01); H05K 5/02 (2006.01); B01D 39/16 (2006.01); B01D 46/54 (2006.01); B29C 55/00 (2006.01); B29C 55/14 (2006.01); C08J 5/18 (2006.01); B29K 27/18 (2006.01); B29L 31/00 (2006.01); H04M 1/02 (2006.01);
U.S. Cl.
CPC ...
C08J 9/141 (2013.01); B01D 39/1692 (2013.01); B01D 46/543 (2013.01); B29C 55/005 (2013.01); B29C 55/143 (2013.01); C08J 5/18 (2013.01); H05K 5/0214 (2022.08); B01D 2239/1291 (2013.01); B29K 2027/18 (2013.01); B29L 2031/755 (2013.01); C08J 2203/14 (2013.01); C08J 2327/18 (2013.01); H04M 1/0202 (2013.01);
Abstract
Provided is a porous polytetrafluoroethylene membrane in which an absolute value of a difference in lightness between one principal surface and the other principal surface is 1.0 or more, where the lightness is lightness L* of CIE 1976 (L*, a*, b*) color space specified in JIS Z8781-4: 2013. The porous polytetrafluoroethylene membrane may be colored black or gray. The porous polytetrafluoroethylene membrane provided can have properties with a reduced coloring-induced deterioration.