1,5-benzodiazepine derivatives
CA 2087672 C · Owner: Finch, Harry · Inventors: Tarzia, Giorgio; Feriani, Aldo; Trist, David Gordon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of general formula (I), (see Formula I) wherein, R1 represents a phenyl, C3-7cycloalkyl C7-11 bridgedcycloalkyl or C1-6alkyl , group which alkyl group may be substituted by a hydroxy; phenyl C1-6alkoxycarbonyl;, C3-7cycloalkyl, or C7-11 bridgedcycloalkyl group; R2 represents a substituted or unsubtituted phenyl group (wherein the substitutents may, be 1 or 2 of halo, C1-4alkyl nitro, cyano, trifluoromethyl, trifluoromethoxy C1-4alkylthio, or (CH2)n R4 wherein R4 is hydroxy C1-4alkoxy, CO2R5 or NR6R7. R3 is phenyl optionally substituted by one or two halogen atoms; R5 represents hydrogen or a C1-4alkyl group; R6 and R7 independently represent hydrogen or a C1-4alkyl group. R8 …
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 January 20, 1993 and granted August 5, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 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.