1-aryl-1,8-naphthylidin-4-one derivative as type iv phosphodiesterase inhibitor
CA 2268190 A1 · Owner: Hayashi, Yasuhiro · Inventors: Inoue, Hidekazu; Hayashi, Yasuhiro; Shimamoto, Tetsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A 1-aryl-1,8-naphthylidin-4-one derivative having formula (I) wherein R1 , indicates a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group, R2, R3 and R4 independently indicate a , hydrogen atom a substituted or unsubstituted lower alkyl group or a halogen , atom; X indicates a group NR5R6 or a group OR7 wherein R5 and R6 , independently indicate a hydrogen atom a substituted or unsubstituted lower , alkyl group a substituted or unsubstituted cycloalkyl group a substituted or , unsubstituted aryl group or a substituted or unsubstituted heteroaryl group and R7 indicates a hydrogen atom, a substituted or unsubstituted lower alkyl group, or a …
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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 August 6, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2020.
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Timeline
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.