1-2h-1-benzopyran-2-one-8-yl-piperazine derivatives
CA 2134630 A1 · Owner: Van Der Heyden, Johannes Anthonius Maria · Inventors: Van Der Heyden, Johannes Anthonius Maria; Schipper, Jacques; Hartog, Jan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a group of new 1-2H-1-benzopyran-2-one-8-yl-piperazine derivatives having interesting pharmacological properties due to 5-HT1A agonism and 5-HT10-antagonism. The compounds have the general formula (1) (1), wherein, - R1 is alkyl (1-4C), alkoxy (1-4C) hydroxy, alkoxy(1-4C)alkyl(1-4C), pyrrolidinyl piperidinyl, morpholinyl, halogen, cyano trifluoromethyl, amino, or mono- or, disubstituted amino wherein the substituents are alkyl (1-4C) or alkyl(1-, 4C)carbonyl, - m has the value 0 1 or 2, - R2 is alkyl (1-4C), alkoxy (1-4C) halogen or trifluoromethyl, - n is 0 or 1 on the understanding that m + n is at least 1 - R3 is hydrogen, alkyl (1-3C) or alkenyl (2-3C) - R4 is …
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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 October 28, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2016.
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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.