Expired Canadian patentCanada
Process for the preparation of 5-membered nitrogen-containing heteroaromatics
CA 1338787 C · Owner: Merck Patent Gesellschaft Mit Beschraenkter Haftung · Inventors: Casutt, Michael; Basedow, Arno; Kirchlechner, Richard
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula I, I, in which A and X1 have the meaning given in Patent Claim 1 can be prepared in a simple manner, in a one-pot process and in high yields.
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 December 10, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 5, 1989
GrantedDecember 10, 1996
Term endedDecember 10, 2013
Patent numberCA 1338787 C
Classification (IPC)C07D207/34 +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.