Method of producing fluoromethyl 1,1,1,3,3,3-hexafluoroisopropyl ether
CA 2215993 C · Owner: Kawai, Toshikazu · Inventors: Watanabe, Mineo; Kawai, Toshikazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel process for preparing fluoromethyl 1,1,1,1,3,3,3 hexafluoroisopropyl ether which comprises bringing a polyether represented by the following general formula (1): R1 O(CH2 O)n R2 into contact with hydrogen fluoride and a medium comprising a reaction accelerator (wherein R1 and R2 are each independently hydrogen C1-C10 alkyl or haloalkyl (wherein the halogen is fluorine chlorine or bromine);, and n is an integer of 1 to 10 with the proviso that both R1 and R2 do not represent hydrogen at the same time).
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 January 22, 1997 and granted July 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2019.
- 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.