Process for the preparation of novel xanthones, salts and esters thereof
CA 1069896 A · Owner: Roussel-Uclaf · Inventors: Ramm, Peter J.; Barnes, Alan C.; Hairsine, Peter W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Xanthones of the general formula: (I), and the pharmaceutically acceptable salts and esters thereof wherein A represents a carboxy group; R represents a hydrogen atom, an alkyl group with 1 to 9 carbon atoms an alkoxy group, with 1 to 9 carbon atoms or an alkoxyalkoxy group with 2 to 9 carbon atoms; and X represents a group of the formula: (Ia) or (Ib), in which R1 represents an alkyl group with 1 to 5 carbon atoms; R2 represents a hydrogen atom, an aliphatic acyl group with 1 to 5 carbon atoms, an aroyl group with 7 or 8 carbon atoms an, aralkyl group with 7 or 8 carbon atoms a p-toluenesulfonyl group, a radical of the formula -CO-(CH2)n-Het (in which n is an integer from 1 to 3 and Het …
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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 January 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 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.