Process for preparing new n-acyl-2,3-benzodiazepine derivatives, their acid addition salts and pharmaceutical compositions containing the same
CA 2057504 C · Owner: Goldschmidt, Katalin · Inventors: Tarnawa, Istvan; Farkas, Sandor; Andrasi, Ferenc
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 N-acyl-2,3-benzodiezapine derivatives of the general formula (I) their, stereoisomers and acid-addition salts pharmaceutical, compositions containing them and a process for their preparation. (see formula I), In the general formula (I) R stands for a C1-6 aliphatic acyl group optionally substituted by a methoxy, cyano, carboxyl amino, C1-4 alkylamino, di(C1-4 alkyl)amino pyrrolidino, phthalimido or phenyl group or by one or more, halogen(s); or R is a benzoyl cyclopropanecarbonyl, C1-5 alkylcarbamoyl or phenylcarbamoyl group; or R is absent when a double bond exists between the N(3) and C(4)atoms;, R1 means hydrogen; or R1 is absent when a double bond exists …
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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 12, 1991 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 12, 2013.
- 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.