Process for the production of 2,3,5,6- tetrachloropyridineand 2,3,6,-trichloropyridine
CA 1301764 C · Owner: Desjardin, Michael A. · Inventors: Desjardin, Michael A.; Kindorf, Todd E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vapor phase chlorination of 2,6-dichloropyridine produces 2 9 3,6-trichloropyridine selectively over isomeric 2,4 9 6-trichloropyridine and of 2,3,6trichloropyridine produces 2,3,5,6-tetrachloropyridine in high selectivity over isomeric 2,3 7 4,6-tetrachloroyridine at temperatures of 300°C to 450°C. The products are intermediates for insecticides and herbicides. 35,270-F
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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 May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 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
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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.