Processes for the preparation of chlorinated phenols
CA 1084531 A · Owner: Lankro Chemmicals Limited · Inventors: Braithwaite, Malcolm J.; Dignum, George; Binns, John S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PROCESSES FOR THE PREPARATION OF, CHLORINATED PHENOLS" Abstract of the disclosure, The invention relates to the batch or continuous parachlorination of para-unsubstituted phenols especially ortho-, cresol, using sulphuryl chloride in the presence of one or more rate and selectivity catalysts, and to the avoidance of the reaction mixture going solid. It concerns specifically the carrying out of the chlorination process in stages each stage, involving only part of the sulphuryl chloride needed for the chlorination and being carried to completion before there is added to the mixture the sulphuryl chloride for the next stage. In addition the invention concerns specifically the selection and …
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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 August 26, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 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.