Naphthothiopyranone derivatives
CA 2086013 A1 · Owner: Hatayama, Katsuo · Inventors: Nakashima, Yoshimoto; Hatayama, Katsuo; Sano, Tatsuhiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A naphthothiopyranone derivative represented by the formula:, . (wherein R1 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms) and an acid addition salt thereof have more excellent antagonist effect at serotonin 3 receptors than the prior art compounds and the effects based thereon, e.g. anti-vomiting effect gastrointes-, tinal movement regulating effect and anti-anxiety effect.
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 June 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 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.