Rhodanine derivatives and pharmaceutical compositions
CA 2016665 C · Owner: Kinoshita, Nobuhiro · Inventors: Kinoshita, Nobuhiro; Inoue, Hitoshi; Sueda, Noriyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a rhodanine derivative of formula (I). A rhodanine derivative of formula (I) (see formula I), wherein R1 is hydrogen C1-C8 alkyl, carboxyl(C1-C4)alkyl or, (C1-C4)alkoxycarbonyl(C1-C4)alkyl; R2 is -CH2-CH2-R3, ~CH=CH~R3 (m is 0 or 1) (see formula II) (R is C1-C3 alkyl) or ~CH2~CONHR4 (n is 0 or 1-4);, R3 is a thienyl or furyl group which may be substituted by C1-C3 alkyl or halogen; a pyrrolyl group which may be substituted by carboxy(C1-C3)alkyl on the nitrogen atom; or a phenyl group which may be substituted by one or more substituents selected from the group consisting of C1-C3 alkyl, C1-C3 alkoxy, hydroxyl halogen, trifluoromethyl, carboxyl, (C1-C3)alkoxycarbonyl cyano, …
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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 May 14, 1990 and granted October 10, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 14, 2012.
- 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.