Quinazoline-4-one ampa antagonists
CA 2239705 C · Owner: Chenard, Bertrand Leo · Inventors: Welch, Willard Mckowan Jr.; Chenard, Bertrand Leo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are novel quinazolin-4-one derivatives of the formula I, (see formula I), (in which the dashed line represents an optional double bond; A is a benzo or thieno ring; B is phenyl pyridyl or, pyrimidyl; X is N or CH; R1 is hydrogen or a substituent; R2 is a substituent such as halo; and R3 and R4 are hydrogen or a substituent), pharmaceutical compositions containing such compounds to treat neurodegenerative, psychotropic and drug, and alcohol induced central and peripheral nervous system disorders.
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 June 5, 1998 and granted June 11, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2020.
- 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.