Process for producing 1,1,1,2,3,3,3-heptafluoropropane
CA 2194994 C · Owner: Aoyama, Hirokazu · Inventors: Shibata, Noriaki; Aoyama, Hirokazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) by the reaction of hexafluoropropene (HFP) with anhydrous hydrofluoric acid (HF) in the presence of an antimony catalyst, whereby HFC-227ea can be produced in a high yield without giving by-products under mild reaction conditions.
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 July 11, 1995 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 11, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 2017.
- 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.