Extractive distillation of hydrocarbons employing solvent mixture
CA 2013526 C · Owner: Phillips Petroleum Company · Inventors: Lee, Fu Ming; Brown, Ronald E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mixture of (a) at least one saturated C5-C9 alcohol (preferably cyclohaxanol) and (b) at least one glycol compound (preferably tetraethylene glycol) is used as solvent in the extractive distillation of a feed mixture comprising cycloalkane(s) (in particular cyclohexane) and closs-boiling alkane(s).
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
- Filed March 30, 1990 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2012.
- 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.