Tricyclic fused heterocycle compounds, process for preparing the same and use thereof
CA 2370013 A1 · Owner: Ohtsuka, Naomi · Inventors: Ohtsuka, Naomi; Hata, Junichiro; Takeo, Jiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds represented by general formula (1) or pharmaceutically acceptable salts thereof. In said formula, X is CH CH2, CHR (wherein R is lower alkyl or substituted lower alkyl), or CRR' (wherein R and R' are each as defined above as to R); Y is CH, CH2, or C=O; Z is O S, S=O, or SO2; U is C or N; R1 to R4 are each independently hydrogen, OR, SR (wherein R is as defined above) an , aromatic ring, a heterocycle, or the like; and at least one of R5 to R8 is OH. The compounds exhibit excellent pharmacological activities such as relaxation of tracheal smooth muscle, suppression of respiratory tract hypersensitiveness, and inhibition of phlogocytic infiltration into the respiratory …
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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 June 2, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 2, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2022.
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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.