Expired Canadian patentCanada
Preparation of (trifluoromethyl)pyridines
CA 1202975 A · Owner: The Dow Chemical Company · Inventors: Fujioka, George S.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Trichloromethyl)pyridine compounds are reacted in the liquid phase with HF in the presence of a metal halide catalyst at superatmospheric pressures to form (trifluoromethyl)pyridine compounds in a high yield.
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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
- Granted April 8, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 8, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 25, 1983
GrantedApril 8, 1986
Term endedApril 8, 2003
Patent numberCA 1202975 A
Classification (IPC)C07D213/61
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.