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:
Mar. 03, 2020
Filed:
Oct. 23, 2013
Toyobo Co., Ltd., Osaka-shi, Osaka, JP;
TOYOBO CO., LTD., Osaka-shi, JP;
Abstract
A porous hollow fiber membrane is provided for the treatment of a protein-containing liquid, which can effectively separate and remove a substance such as a small diameter virus, and which can allow effective permeation of a useful substance to be recovered such as protein in high concentration. The porous hollow fiber membrane has an asymmetric structure having a dense layer in an outer layer only and contains a hydrophobic polymer and a first hydrophilic polymer, the surface and the porous part of the hollow fiber membrane are coated with a second hydrophilic polymer, the hydrophobic polymer is a polysulfone-type polymer, the first hydrophilic polymer is a copolymer of vinylpyrrolidone with vinyl acetate, and the second hydrophilic polymer is a polysaccharide or a polysaccharide derivative. The porous hollow fiber membrane is obtained by co-dissolving the hydrophobic polymer and the first hydrophilic polymer and then the second hydrophilic polymer is coated.