Production of fluoromethyl 2,2,2-trifluoro-1-(trifluoromethyl)ethyl ether
CA 2689573 C · Owner: Halocarbon Products Corporation · Inventors: Khrimian, Ashot; Jones, Barry Malcolm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for preparing flouromethyl2,2,2-trifluoro-1- (trifluoromethyl) ethyl ether (sevoflurane) by reacting 1,1,1,3,3,3-hexafluoro-2-propanol with formaldehyde and hydrogen fluoride either (a) under distillation conditions or (b) in the presence of or with the subsequent addition of a solvent capable of selectively extracting sevoflurane.
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 15, 2001 and granted May 22, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 2023.
- 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.