Novel biologically active eburnamenine derivatives, pharmaceutical compositions containing them and process for preparing same
CA 2136547 A1 · Owner: Richter Gedeon Vegyeszeti Gyar Rt. · Inventors: Baloghne Kardos, Zsuzsa; Kiss, Bela; Palosi, Eva
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to novel eburnamenine derivatives of formula (I) wherein R1 and R2 as well as R3 and R4 inde-, pendently from each other, stand for hydrogen C2-6alkyl group, C2-6alkenyl group; or a C3-10alicyclic group involving 1 to 3 rings, and this latter group may be substituted by a C1-6alkyl or C2-6alkenyl group; or R1 and R2 and/or R3 and R4 to-, gether with the adjacent nitrogen atom and optionally with an additional oxygen or nitrogen atom form a 4- to 6-mem-, bered, saturated or unsaturated cyclic group which may be substituted by a C1-6alkyl or C2-6alkenyl group; two of X Y and, Z are nitrogen whereas the third of them means a methine group; n is 1 or 2; W means oxygen or …
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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 June 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2015.
- 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.