Neuroprotective 3-(piperidinyl-1)-chroman-4,7-diol and 1-(4-hydrophenyl)-2-(piperidinyl-1)-alkanol derivatives
CA 2197451 C · Owner: Chenard, Bertrand L. · Inventors: Butler, Todd W.; Chenard, Bertrand L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to compounds of formula (I) or pharmaceutically , acceptable acid addition salts thereof wherein: (a) R2 and R5 are taken , separately and R1 R2, R3 and R4 are each independently hydrogen (C1-C6) , alkyl, halo, CF3, OH or OR7 and R5 is methyl or ethyl; or (b) R2 and R5 are taken together, forming a chroman-4-ol ring and R1, R3 and R4 are each , independently hydrogen (C1-C6) alkyl, halo, CF3, OH or OR7; and R6 is a substituted piperidinyl, pyrrolidinyl or 8-azabicyclo(3.2.1)octanyl derivative; provided that (a) when R2 and R5 are taken separately at least , one of R1, R2, R3 and R4 is not hydrogen; and (b) when R2 and R5 are taken together, at least one of R1, R3 …
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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 May 18, 1995 and granted January 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2017.
- 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.