Expired Canadian patentCanada
Process for preparing 2-dihydroxy substituted 4-hydroxy-quinoline carboxylic acid derivatives, eventually etherified or esterified
CA 1262903 C · Owner: Aventis Pharma S.A. · Inventors: Clemence, Francois; Delevallee, Francoise; Le Martret, Odile
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 November 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 14, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 24, 1986
GrantedNovember 14, 1989
Term endedNovember 14, 2006
Patent numberCA 1262903 C
Classification (IPC)C07D215/56 +2 more
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.