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:
Nov. 03, 2015
Filed:
Sep. 24, 2009
Satoshi Shiki, Tokyo, JP;
Satoshi Shiki, Tokyo, JP;
ASAHI KASEI CHEMICALS CORPORATION, Tokyo, JP;
Abstract
A porous membrane with the membrane wall constructed of a hydrophobic polymer and a hydrophilic polymer, wherein when the membrane wall is divided into 3 sections in the film thickness direction to form region 'a' containing one wall surface A of the membrane wall, region 'c' containing the other wall surface C and region “b” between region “a” and region “c”, the hydrophilic polymer content ratio Cin region “a” is greater than the hydrophilic polymer content ratio Cin region “c”, and the mean pore size of the wall surface C is larger than the mean pore size of the wall surface A.