Imidazonaphthyridine derivatives
CA 2043715 C · Owner: Suzuki, Fumio · Inventors: Ohmori, Kenji; Suzuki, Fumio; Kuroda, Takeshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are imidazonaphthyridine derivatives represented by formula (I), (I), wherein: R1 represents lower alkyl or substituted or unsubstituted aryl; and, X-Y-Z represents , or wherein, R2 represents hydrogen, lower alkyl alkeny1, aralkeny1, or, -C(R5)H-(CH2)n-R4 (wherein R4 represents substituted or unsubstituted aryl, substituted or unsubstituted pyridyl substituted or unsubstituted furyl, hydroxy-substituted lower alkyl, lower alkanoyloxy, morpholino lower alkanoyl, carboxy, lower alkoxycarbonyl cycloalkyl, hydroxy, lower, alkoxy, halogen or NR6R7 wherein R6 and R7 independently represents hydrogen or lower alkyl; R5 represents hydrogen lower alkyl, or phenyl; and n represents an …
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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 31, 1991 and granted January 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 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.