Indole derivatives
CA 2064853 C · Owner: Mizusuna, Akira · Inventors: Mizusuna, Akira; Endo, Takashi; Onoda, Yoshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a indole derivative represented by the general formula (1) (see fig. I), wherein R1 stands for alkyl of 1 to 5 carbon atoms cycloalkylalkyl of 4 to 7 carbon atoms cycloalkenylalkyl, of 5 to 7 carbon atoms aralkyl of 7 to 14 carbon atoms, trans-alkenyl of 4 or 5 carbon atoms allyl, furanyl-2-ylalkyl , of 1 to 5 carbon atoms thienyl-2-ylalkyl of 1 to, carbon atoms vinyloxycarbonyl, trichloroethoxycarbonyl benzyloxycarbonyl, alkanoyl of 1, to 5 carbon atoms aralkylcarbonyl of 7 to 14 carbon, atoms 2-furoyl, thiophene-2-carbonyl, cycloalkylcarbonyl of 4 to 7 carbon atoms, alkenylcarbonyl of 3 to 8 carbon atoms, or anisoyl, R2 for a hdyrogen atom alkyl of 1 to, 3 …
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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 5, 1991 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 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.