Expired Canadian patentCanada
Dehydration of organic oxygenates
CA 1322764 C · Owner: Reale, John Jr. · Inventors: Reale, John Jr.; Bartels, Craig R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
OF THE INVENTION, D# 79,078-F) Concentration of aqueous solutions of isopropanol may be effected by a composite membrane including a glutaraldehyde cross-linked polyvinyl alcohol bonded to a porous layer of polysulfone on a polyester backing.
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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 October 5, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 5, 2010.
- 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 12, 1989
GrantedOctober 5, 1993
Term endedOctober 5, 2010
Patent numberCA 1322764 C
Classification (IPC)C07C29/76 +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.