Substituted n-phenylpiperidines and drugs therefrom
CA 2063030 C · Owner: Basf Aktiengesellschaft · Inventors: Kirchengast, Michael; Schult, Sabine; Lubisch, Wilfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substituted N-phenylpiperid-, ines I, (see formula I) (R1 = H, NO2, CN, halogen, C1-C4-alkyl CF3, OCF3, OH, CH2OH, COOH, CHO, NH-CHO NH2, CO-NH2, 5-tetrazinyl, R4-O-, R4-O-CH2- R4-O-CO-, R4-CO-, R4-NH-CO, R4-CO-NH-, R4-SO2-NH-; R2 = H, NO2, halogen, C1-C4-alkyl or R4-O-; (see formula II) (see formula III), (see formula IV) (see formula V) (see formula VI) (see formula VII) (see formula VIII), R4 = C1-C4-alkyl or phenyl which can carry one of the R2 radicals;, R5, R6, H or one of the R4 radicals; R7 = one of the R1 radicals;, n = 0 or 1; m = 1 or 2;, with the proviso that R3 is (see formula IX) only when n is 1, and the optical isomers in the case of optical isomerism and the physiologically …
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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 March 13, 1992 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 2014.
- 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.