Heterocyclic compounds
CA 2066640 C · Owner: White, Janet C. · Inventors: Ward, Terence J.; White, Janet C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I); wherein R1 is hydrogen or one or more specified substituents. X is -O- or -NR2, where R2 is lower alkyl; lower alkenyl, lower alkynyl aryl or specified substituted lower , alkyl or R2 represents a group -Z- which is connected to the 8-position of the aromatic ring so as to form a heterocyclic ring of 5 to 7 ring members, Y is O or NR3 where R3 is hydrogen or lower alkyl; and B is a saturated azabicyclic ring (e,g. tropanyl or quinuclinidyl) or a N-oxide thereof and their acid addition salts are 5-HT3 antagonists which maybe used in for , example, the treatment of neuro-psychiatric 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 October 10, 1990 and granted August 1, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 10, 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.