4-amino-3-acylnaphthyridine derivatives
CA 2209422 C · Owner: Yoo, Han Yong · Inventors: Chang, Man Sik; Sohn, Sang Kwon; Kim, Young Hun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel 4-amino-3-acylnaphthyridine derivatives represented by general formula (I), wherein R1 is hydrogen atom, a C1-C6 lower alkyl group a C1-C6 lower , alkoxy group, a C1-C6 lower alkoxyalkyl group a C3-C6 cycloalkyl group, a C3-, C6 cycloalkyl C1-C6 alkyl group a substituted or unsubstituted phenyl, or a phenyl C1-C6 alkyl group of which phenyl group may be substituted; R2 is hydrogen atom, a C1-C6 lower alkyl group a C1-C6 alkoxy group, a C1-C6 , alkylthio group or a group of a formula: NR6R7 wherein R6 and R7 identical , to or different from each other are independently hydrogen atom or a C1-C6 lower alkyl group, or R6 and R7 may form together 5-membered or 6-membered cycloalkyl …
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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 1, 1996 and granted September 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 1, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.