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. 31, 1998
Filed:
Jul. 25, 1997
Applicant:
Inventors:
Ude Scheunemann, Liederbach, DE;
Olaf Althoff, Niedernhausen, DE;
Werner Hickel, Ludwigshafen, DE;
Gunther Appel, Hattersheim, DE;
Jacqueline Bauer, Oberursel, DE;
Gerhard Geiss, Liederbach, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B29C / ; B01D / ;
U.S. Cl.
CPC ...
428447 ; 264298 ; 264216 ; 264204 ; 264207 ; 264 41 ; 210490 ; 2105 / ;
Abstract
To produce a composite membrane, the solution of a polymer in a volatile organic solvent is spread on water, the solvent is allowed to evaporate, the polymer is crosslinked and the polymer film formed is transferred to a porous support membrane. The polymer is preferably a polysiloxane which is cross-linked via polymer-bonded OH groups. The composite membrane is suitable, inter alia, for pervaporation.