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:
Apr. 01, 1997
Filed:
Jun. 18, 1996
Applicant:
Inventor:
Russell B Hodgdon, Sudbury, MA (US);
Assignee:
Ionics, Incorporated, Watertown, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
210651 ; 210652 ; 210653 ; 210654 ; 21050037 ; 21050038 ; 21032172 ;
Abstract
Improved nanofiltration apparatus and processes utilizing thin film composite asymmetric nanofiltration membranes in which the thin film semi-permeable barrier layer consists of substantially 'all aliphatic' polymer(s) prepared, for example, by the interfacial polymerization of one or more aliphatic monomers having two or more substituents selected from the group consisting of primary and secondary amine substitutents with one or more aliphatic monomers having two or more acid halide substituents. The monomers are linked together in the thin film substantially exclusively by amide linkages.