Novel antihistaminic piperidine derivatives and intermediates for the preparation thereof
CA 2491932 A1 · Owner: Hmr Pharma Inc. · Inventors: Ayers, Timothy A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to novel piperidine derivatives of Formula (I) (see formula I), and a process for the preparation thereof wherein, R1 is H or C1-C6alkyl wherein the C1-C6alkyl moiety is straight or branched;, R2 is -COOH or -COOalkyl wherein the alkyl moiety has from 1 to 6 carbon atoms and is straight or branched; or stereoisomers or pharmaceutically acceptable acid addition salt 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 June 17, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 17, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2021.
- 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.