Substituted piperazine and piperidine calcium channel blockers
CA 2394327 C · Owner: Zamponi, Gerald W. · Inventors: Zamponi, Gerald W.; Snutch, Terrance P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula, see formula I) and their salts, wherein Cy represents cyclohexyl; Y is CH=CH.PHI. CH.PHI.2, .PHI. or Cy, X is trivalent straight-chain alkylene (3-10C) or trivalent straight-chain 1alkenylene , (3-10C) optionally substituted by oxo at the C adjacent N when n is 0 and Y is .PHI.2CH; and is , otherwise trivalent straight-chain alkylene (5-10C) or trivalent straightchain 1-alkenylene (5-, 10C) optionally substituted by oxo at the C adjacent N; Z is N, NCO, CHNCOR1 or CHNR1, wherein R1 is alkyl (1-6C); and n is 0-5;, wherein each .PHI. and Cy independently may optionally be substituted by alkyl (1-6C) or , by halo, CF3, OCF3, NO2, NR2 OR, SR, COR, COOR, CONR2, …
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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 20, 2000 and granted January 24, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2022.
- 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
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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.