Expired Canadian patentCanada
Semipermeable membranes of sulphonated polybenz-1,3-oxazin-2,4-diones
CA 1046188 A · Owner: Bayer Aktiengesellschaft · Inventors: Hinz, Jurgen; Binsack, Rudolf; Elfert, Klaus
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Semipermeable membranes of sulphonated polybenz-1,3-oxazin- 2,4-diones for seperating or enriching organic sulphonates by the method of inverse osmosis or ultrafiltration.
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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 January 9, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 9, 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.
Filed—
GrantedJanuary 9, 1979
Term endedJanuary 9, 1996
Patent numberCA 1046188 A
Classification (IPC)C08J5/22 +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.