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. 18, 1990
Filed:
Oct. 31, 1988
Applicant:
Inventors:
Larry F Wieserman, Apollo, PA (US);
Karl Wefers, Apollo, PA (US);
Kathryn Cross, Murrysville, PA (US);
Edward S Martin, New Kensington, PA (US);
H Philip Hsieh, Murrysville, PA (US);
William H Quayle, Murrysville, PA (US);
Assignee:
Aluminum Company of America, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; B01D / ; B01J / ; B01J / ;
U.S. Cl.
CPC ...
502-4 ; 55 16 ; 55158 ; 21050021 ; 21050025 ; 21050026 ; 21050027 ; 427244 ; 435176 ; 435177 ; 502-7 ; 502 62 ; 502401 ; 502415 ;
Abstract
A treated permeable inorganic membrane having good chemical stability over a pH range of from 1 to 14. The monomolecular layer of organic acid material is formed on the membrane surface by contacting phosphonic acid having the formula RPO(OH).sub.2 ; phosphinic acid having the formula RR'PO(OH); monocarboxylic acids having the formula RCOOH; dicarboxylic acids having the formula R'(COOH).sub.2 ; or boronic acid having the formula RB(OH).sub.2.