4-imidomethyl-1-2'phenyl-2'oxoethyl-piperidines as serotonin 5ht2-antagonists, their preparation and use in therapy
CA 2134077 C · Owner: Merrell Pharmaceuticals Inc. · Inventors: Nieduzak, Thaddeus R.; Dudley, Mark W.; Kehne, John H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a new class of serotonin 5HT2 antagonists of formula (I) and their use in the treatment of a variety of diseases, in which R is represented by hydrogen halog-, en, C1-4 alkyl, C1-4 alkoxy, -CF3 -OH, or -COF3; and A is repre-, sented by one of the following imide derivatives in which R1 and R2 are each independently represented by (Ia) (Ib), (Ic), (Id), (Ie), (If), (Ig), (Ih) hydrogen, halogen, C1-4 alkyl, C1-4 alkoxy -CF3, -OH, or -OCF3; and the pharmaceutically acceptable salts thereof.
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 March 24, 1993 and granted May 21, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 2015.
- 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.