Amino acid derivative anticonvulsant
CA 2017217 C · Owner: Watson, Darrell · Inventors: Watson, Darrell; Kohn, Harold L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to compounds exhibiting central nervous system (CNS) activity which are useful in the treatment of epilepsy and other CNS disorders. The compounds of this invention have the following general formula: and pharmaceutically acceptable salts thereof wherein R is aryl, aryl lower alkyl, heterocyclic or heterocyclic lower alkyl, wherein R is unsubstituted or is substituted with at least one electron withdrawing group of an electron donating group;, R1 is hydrogen or lower alkyl and R1 is unsubstituted or is substituted with at least one electron withdrawing substituent or at least one electron donating substituent; R2 and R3 are independently each hydrogen lower, …
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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
- Filed May 18, 1990 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2012.
- 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.