Process for preparing 2,3,4,5-tetrachloro-6- (trichloromethyl) pyridine
CA 1304089 C · Owner: Lubetzky, David · Inventors: Sharvit, Joseph; Pereferkovich, Abraham Adolf; Lubetzky, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Heptachloropicoline is prepared by continuously reacting chlorine in the gas phase at an elevated temperature with one or more lower-chlorinated 6-trichloromethyl pyridines in the presence of an effective amount of ferric chloride.
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 June 23, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 23, 2009.
- 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.