Method of treating semipermeable membranes
CA 1060285 A · Owner: Uop Inc. · Inventors: Kremen, Seymour S.; Foreman, Gerald E.; Chirrick, John M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of improving the rejection performance of semipermeable membranes by incorporating thereinto an effective amount of a supplemental polymer containing a substantial amount of acetyl groups. A suitable supplement polymer is a copolymer of vinyl acetate and one or more reactants such as, maleic acid or a half-ester thereof crotonic acid, and lower, alkyl esters of acrylic acid. The copolymer may be stabilized by subsequent treatment with a multivalent cation.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted August 14, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 14, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.