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. 22, 2025
Filed:
Mar. 17, 2021
Applicant:
Asahi Kasei Medical Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
ASAHI KASEI MEDICAL CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D 69/08 (2006.01); B01D 67/00 (2006.01); B01D 69/00 (2006.01); B01D 69/02 (2006.01); B01D 69/06 (2006.01); B01D 71/06 (2006.01); B01D 71/34 (2006.01); B01D 71/68 (2006.01);
U.S. Cl.
CPC ...
B01D 69/08 (2013.01); B01D 67/0009 (2013.01); B01D 67/003 (2013.01); B01D 67/0088 (2013.01); B01D 69/00 (2013.01); B01D 69/02 (2013.01); B01D 69/06 (2013.01); B01D 71/34 (2013.01); B01D 71/68 (2013.01); B01D 71/06 (2013.01); B01D 2323/02 (2013.01); B01D 2323/06 (2013.01); B01D 2323/22 (2013.01); B01D 2325/02 (2013.01); B01D 2325/20 (2013.01); B01D 2325/36 (2013.01); C08J 2201/0464 (2013.01);
Abstract
A porous membrane containing a hydrophobic polymer and a water-insoluble hydrophilic polymer, the porous membrane having a dense layer in the downstream portion of filtration in the membrane, having a gradient asymmetric structure in which the average pore diameter of fine pores increases from the downstream portion of filtration toward the upstream portion of filtration, and having a gradient index of the average pore diameter from the dense layer to the coarse layer of 0.5 to 12.0.