Tricyclic compounds and intermediates thereof
CA 2059792 C · Owner: Kubo, Kazuhiro · Inventors: Oda, Shoji; Harakawa, Hiroyuki; Kubo, Kazuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disc1osed is a tricyc1ic compound represented by the formula (I):, wherein each of R1, R2 R3 and R4 independently represents, hydrogen C1-6 alkyl, C1-6 alkoxy, C1-6 alkylthio amino, C1-6 alkylamino, halogenated C1-6 alkyl halogenated C1-6, alkoxy, halogen, vitro cyano, carboxy, C1-6 alkoxycarbonyl, hydroxymethyl CR9R10C02R11 (wherein each of R9, R10 and R11 independently represents hydrogen or C1-6 alkyl) or CONR12R13 (wherein each of R12 and R13 independently represents hydrogen or C1-6 alkyl) R5 represents hydrogen or C1-6 alkyl; each of R6; R7 and R8 independently represents hydrogen, C1-6 alkyl, hydroxy; C1-6 alkoxy C1-6, alkanoyloxy, C1-6 alkylthio, thiocyanato or halogen; X represents …
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 22, 1992 and granted July 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2014.
- 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.