Optically active dihydropyridine derivative
CA 2511595 C · Owner: Kobayashi, Takashi · Inventors: Kobayashi, Takashi; Sada, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Provided is an optically active dihydropyridine derivative which is designated (R)-2-amino-1,4-dihydro-6-methyl-4-(3-nitrophenyl)-3,5-pyridinecarboxylic acid 3-(1-, diphenylmethylazetidin-3-yl) ester 5-isopropyl ester and has the following chemical , structure:, (see above formula) and pharmacologically 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 December 24, 2003 and granted April 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 24, 2025.
- 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.