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:
Jan. 21, 1992
Filed:
Nov. 07, 1990
Applicant:
Inventors:
Michael Haubs, Bad Kreuznach, DE;
Hansotto Drotloff, Frankfurt am Main, DE;
Juergen Wildhardt, Huenstetten-Wallrabenstein, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ;
U.S. Cl.
CPC ...
210650 ; 21050021 ; 21050027 ; 21050028 ; 55 16 ;
Abstract
A semipermeable membrane of polyether ketones is disclosed. It contains a polymer possesssing the following recurring units: ##STR1## where x denotes ##STR2## with R.sub.1, R.sub.2, R.sub.3 and R.sub.4 being identical to or different from one another and denoting H, alkyl, aryl, oxyaryl, NO.sub.2, CN, NR.sub.2 or halogen, and