Process for preparing fluoroalkyl vinyl compound
CA 2015247 C · Owner: Nakagawa, Youichi · Inventors: Nakagawa, Youichi; Yamaguchi, Fumihiko; Yoshida, Tutomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to fluoroalkyl vinyl compounds of the formula:, R f CF=CH2 (I) wherein R f is a fluoroalkyl group having 1 to 10 carbon atoms. The compounds of the present invention are prepared in a high yield by reacting a fluoroalkyl vinyl halide of the formula:, R f CF=CHX (II), or, R f CF=CX2 (III) wherein Rf is the same as defined above and X is a, chlorine atom, a bromine atom or an iodine atom with hydrogen in the presence of a catalyst.
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 April 24, 1990 and granted April 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 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.