Benzodiazepines
CA 2050858 A1 · Owner: Tam, Steve Y. · Inventors: Sim, Iain S.; Bellemin, Anne R.; Keith, Dennis D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Benzodiazepines of formula wherein, X is N(R,R1), OR4 or SR5, R and R1 are N(R2,R3) or substituted lower alkyl or an optionally substituted C3-C7-cycloalkyl, aryl, aralkyl or C2-C6-aliphatic hydrocarbon group, this aliphatic group having one or more double or triple bond, or one of R and R1 is hydrogen or, N(R,R1) is an optionally substitued heterocycle with one or more heteroatoms, R2 and R3 are H, lower alkyl aryl or aralkyl, R4 is lower alkyl or has one of the meanings of R or R1 with the exception of H and of N(R2,R3), R5 is H or lower alkyl or has one of the meanings of R or R1 with the exception of N(R2,R3), Y and Z are H, NO2 N(R2,R3), halogen, CF3, OH, CN or lower alkyl or …
Read the whole patent
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 September 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 6, 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
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.