Process for the preparation of a benzoic acid ester
CA 1300166 C · Owner: F. Hoffmann-La Roche Ag · Inventors: Kjellsaa, Hanny; Kompis, Ivan; Karpf, Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Methyl 4-dimethylamino-3,5-dimethoxybenzoate an, intermediate in the manufacture of the antibacterially active aditoprim, is obtained from 4-amino-3,5-dibromobenzoic acid by replacement of the bromine atoms by methoxy groups and subsequent methylation.
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 May 5, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 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.