Indole-2,3-dione-3-oxime derivatives, their preparation and use
CA 2199613 C · Owner: Watjen, Frank · Inventors: Watjen, Frank; Moldt, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present patent application discloses compounds having formula (I) or a pharmaceutically acceptable salt thereof wherein R1 X and R5 have the , meanings set further in the specification. A is a ring of five to seven atoms fused with the benzo ring at the positions marked a and b. The compounds are useful in the treatment of cerebrovascular disorders for example.
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 September 12, 1995 and granted February 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 12, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 2017.
- 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.