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:
Sep. 29, 1981
Filed:
Sep. 20, 1979
Applicant:
Inventors:
Kiyoshi Ishii, Saitama, JP;
Ryoshu Suzuki, Saitama, JP;
Zenjiro Honda, Saitama, JP;
Hitoshi Tsugaya, Saitama, JP;
Assignee:
Daicel Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C02F / ;
U.S. Cl.
CPC ...
525510 ; 525513 ; 525523 ; 525524 ; 525930 ; 2105002 ;
Abstract
A semipermeable membrane composed of a water-insoluble, cross-linked, membrane-forming polymer (hereinafter referred to as 'polymer (II)') which is obtained by partially converting the hydroxyl groups of a polymer represented by the following formula (hereinafter referred to as 'polymer (I)'): ##STR1## wherein R and R' are halogen, nitro, methyl or ethyl,