Expired Canadian patentCanada
New guanidine derivatives, methods of preparing them and their use as drugs
CA 2259033 C · Owner: Cancer Research Ventures Uk Limited · Inventors: Schilling, Gerhard; Amtmann, Eberhard; Sauer, Gerhard
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns new guanidine derivatives of formula (I) methods of , preparing them and their use in drugs containing such compounds.
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
- Filed May 23, 1997 and granted July 5, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 23, 1997
GrantedJuly 5, 2011
Term endedMay 23, 2017
Patent numberCA 2259033 C
Classification (IPC)C07C281/18 +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.