Expired Canadian patentCanada
Reverse osmosis membrane quenching
CA 1209764 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Sundet, Sherman A.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TITLE, Reverse Osmosis Membrane Quenching ABSTRACT OF THE DISCLOSURE, In the preparation of permselective membranes by extracting a solvent-cast membrane with non-solvent the improvement of quenching with a polar liquid before extraction.
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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 19, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 19, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 24, 1982
GrantedAugust 19, 1986
Term endedAugust 19, 2003
Patent numberCA 1209764 A
Classification (IPC)C08J9/28 +2 more
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.