Expired Canadian patentCanada
Dewaxing with a polyol ester aid
CA 1077698 A · Owner: Unilever Limited · Inventors: Evans, Reginald D. O.; Rand, John A.; Borst, Hans
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for de-waxing oil comprises dissolving a polymerised polyol ester blend in a waxy oil optionally, with a solvent or diluent and cooling to crystallize out the wax using acids in the C8 to C24 range to form the esters.
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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 May 20, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 20, 1997.
- 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—
GrantedMay 20, 1980
Term endedMay 20, 1997
Patent numberCA 1077698 A
Classification (IPC)C09K3/00 +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.