Heterocyclicguanidines as 5ht- antagonists
CA 2016182 C · Owner: Pfizer Limited · Inventors: Rosen, Terry Jay; Rizzi, James Patrick; Nagel, Arthur Adam
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Heterocyclicguanidines at 5HT3 antagonists useful in the treatment of nausea, anxiety, pain schizophrenia, and gastrointestinal disorders. wherein said substituent is each methyl methoxy, chloro, fluoro or bromo; Het is thiazolyl furyl, thienyl or isox-, azolyl; R1 is hydrogen or methyl; R2 and R3 when considered separately are each hydrogen, hydroxyethyl alkyl having, one to six carbon atoms, cycloalkyl having three to six carbon atoms or acetyl; and R2 and R3 when taken together are alkylene having two to three carbon atoms.
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 7, 1990 and granted March 12, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 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.