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:
Feb. 22, 2000
Filed:
May. 13, 1997
Applicant:
Inventors:
Hisao Hachisuka, Osaka, JP;
Kenichi Ikeda, Osaka, JP;
Assignee:
Nitto Denko Corporation, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210490 ; 21050044 ; 21050027 ; 21050021 ; 21050038 ; 427245 ;
Abstract
A reverse osmosis composite membrane comprising at least a porous support membrane layer and a separation layer, wherein a water-insoluble polymer layer having an anionic hydrophilic group formed on the surface of the separation layer is provided. Therefore, it has high anion property, high salt rejection, high water permeability, and chlorine tolerance, and can perform practical desalination under relatively low pressure.