4,5,6,7-tetrahydrobenzimidazole derivatives
CA 2004911 A1 · Owner: Miyata, Keiji · Inventors: Miyata, Keiji; Matsuhisa, Akira; Ohta, Mitsuaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
4,5,6,7-Tetrahydrobenzimidazole derivatives represented by general formula (I), (I) (wherein groups represents the following: R1, R2, R3: independently represent hydrogen atom hydroxy group, a halogen atom, a lower alkyl group which may optionally be, substituted with a halogen atom a, lower alkoxy group, a lower alkylthio group, an aralkyloxy group, an aryloxy group, a lower alkanoyl group, carboxy group, a lower alkoxycarbonyl group, or nitro group; R4, R5, R6: hydrogen atom or a lower alkyl group; X : oxygen atom or sulfur atom;, or salts thereof which are believed to have a 5-HT3 antagonizing activity.
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 December 7, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 7, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2011.
- 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.