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. 06, 1987
Filed:
Jul. 06, 1982
James E Kuder, Fanwood, NJ (US);
John C Chen, Westfield, NJ (US);
Celanese Corporation, New York, NY (US);
Abstract
A process for chemically modifying a preformed polybenzimidazole semipermeable membrane is provided. The process comprises the steps of sulfonating the membrane by contacting the membrane at a temperature within the range of 5.degree. C. to 100.degree. C. with a sulfonating agent and heating the membrane in an inert atmosphere at a temperature and for a period of time sufficient to convert the ionic bonds formed in the contacting step to permanent, covalent bonds, thereby providing a covalently bonded sulfonated polybenzimidazole semipermeable membrane. The membrane produced by the process of the present invention exhibits cation selectivity for electrodialysis and electrochemical applications. Other advantages may include increased water flux for reverse osmosis purposes and increased resistance to fouling.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile