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. 13, 1990
Filed:
Mar. 07, 1988
Cornelius A Smolders, Hengelo, NL;
Antonius C Franken, Enschede, NL;
Marcellinus H Mulder, Enschede, NL;
Akzo NV, , NL;
Abstract
Process for the production of a bilayer membrane consisting of a selectively acting nonporous polymer membrane first layer and a microporous membrane second layer, in which a polymer solution intended for the formation of the first layer is brought into contact with one side of the second layer. A larger amount of polymer solution than is necessary for the formation of the first layer is used, and a portion of the solvent is caused to volatilize through the pores of the second layer. The polymer solution is not caused to enter the pores of the second layer. After the first layer has attained the desired thickness, the excess polymer solution is removed. The first layer may be subjected to a drying and/or cross-linking treatment.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile