Process for preparing 2,3,5,6-tetrachloropyridine and pentachloropyridine
CA 1089468 A · Owner: The Dow Chemical Company · Inventors: Love, Jim; Dietsche, Thomas J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2,3,5,6-Tetrachloropyridine and pentachloropyridine are prepared by reacting a chlorosubstituted (trichloromethyl)pyridine in the liquid state with chlorine at temperatures of at least about 160°C in the presence of a Lewis acid type catalyst. The products are useful as intermediates for the preparation of herbicides and pesticides.
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
- Granted November 11, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 11, 1997.
- 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.