Chromene derivatives and salts thereof, and pharmaceuticals containing the same
CA 2249049 A1 · Owner: Matsuda, Hideaki · Inventors: Konno, Fujiko; Ishii, Fumio; Matsuda, Hideaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are chromene derivatives represented by the following formula:, (see fig. I), wherein R1s represent alkyl alkoxy or like groups, R2, represents a hydrogen atom or an alkyl group R3, represents a substituted or unsubstituted phenyl naphthyl or heterocyclic group, and m stands for an integer of from 0 to 4, and their salts; and pharmaceuticals containing them as effective ingredients. The chromene derivatives and their salts show excellent AGE formation inhibitory action and are useful as preventives and therapeutics for diabetic complications.
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 September 29, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2020.
- 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.