Process for the preparation of fluorinated alkanes from alkenes
CA 2005225 A1 · Owner: Alliedsignal Inc. · Inventors: Tung, Hsueh S.; Sukornick, Bernard; Eibeck, Richard E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for the preparation of fluorinated alkanes. The process comprises the step of: reacting an alkene with carbon having fluorine absorbed therein at a temperature and for a time sufficient to form fluorinated alkanes. The alkene used is not perhalogenated at the double-bonded carbons. Preferably, the alkene used is vinylidene fluoride or ethylene. The process produces products such as 1,1.1,2tetrafluoroethane (known in the art as 134a) which may be used as a refrigerant and 1,1,1-trifluoroethane (known in the art as R143a) and 1,2-difluoroethano (known in the art as R152) which may be used as blowing agents or solvents.
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 December 12, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 12, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2011.
- 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.