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:
Oct. 21, 2025
Filed:
Nov. 19, 2020
Applicant:
Toray Industries, Inc., Tokyo, JP;
Inventors:
Assignee:
TORAY INDUSTRIES, INC., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 71/68 (2006.01); B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 69/08 (2006.01); B01D 71/38 (2006.01); B01D 71/44 (2006.01); B01D 71/82 (2006.01);
U.S. Cl.
CPC ...
B01D 71/68 (2013.01); B01D 67/0088 (2013.01); B01D 69/02 (2013.01); B01D 69/08 (2013.01); B01D 71/381 (2022.08); B01D 71/441 (2022.08); B01D 71/82 (2013.01); B01D 2323/02 (2013.01); B01D 2323/04 (2013.01); B01D 2323/18 (2013.01); B01D 2325/022 (2013.01); B01D 2325/34 (2013.01); B01D 2325/58 (2022.08);
Abstract
The present invention aims to provide a porous separation membrane that does not suffer a significant decrease in the protein permeability even after long term use. The porous separation membrane has an asymmetric structure with a dense layer forming one surface layer and with a coarse layer forming the other surface layer, supports a biocompatible polymer, and meet the requirements (1) and (2) given below in surface analysis of a cross section containing the dense layer and the coarse layer performed by TOF-SIMS: