Pyrazolotriazole derivative
CA 2115996 A1 · Owner: Watanabe, Toshihiro · Inventors: Watanabe, Toshihiro; Yanagisawa, Isao; Inagaki, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a pyrazolotriazole derivative represented by the general formula: wherein each symbol means as follows;, R1 R3 and R4: one of them represents hydrogen tetrazolylated, biphenylmethyl or lower alkyl R2: hydrogen, tetrazolylated biphenylmethyl cycloalkyl or, lower alkyl, and, R5 and R6: these may be the same or different from each other, and each represents hydrogen, halogen tetrazolylated, biphenylmethyl, formyl carboxyl, esterified carboxyl, cycloalkyl lower alkoxy, lower alkoxycarbonyl, or lower alkyl which may be substituted with hydroxyl formyl or, carboxyl, provided that at least one of R1 to R6 is tetrazolylated biphenylmethyl, and the broken lines mean that …
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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 27, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2014.
- 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.