Process for preparing 4-chloro-2,5-dimethoxy aniline
CA 1048546 A · Owner: Hoechst Aktiengesellschaft · Inventors: Hille, Ernst; Mees, Bernhard; Paszthory, Emmerich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PROCESS FOR PREPARING 4-CHLORO-2,5-DIMETHOXY ANILINE Abstract of the Disclosure:, The catalytic hydrogenation of 4-chloro-2,5-dimethoxy nitrobenzene can be performed in water with a nickel catalyst if the average particle size is below 0.1 mm. The resulting aniline is reacted with diketene and the so-obtained N-acetoacetyl derivative is an azoic coupling component.
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 February 13, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 13, 1996.
- 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.