Naphthalene derivatives, their production and use
CA 2328973 A1 · Owner: Tasaka, Akihiro · Inventors: Kaku, Tomohiro; Kusaka, Masami; Yamaoka, Masuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition containing a compound of formula (I) wherein A is a nitrogencontaining heterocyclic group which may be substituted R1 is a hydrogen atom, hydrocarbon group which may be substituted or monocyclic aromatic , heterocyclic group which may be substituted R2 is a hydrogen atom or a lower , alkyl group which may be substituted R3, R4, R5, R6, R7, R8 and R9 are , independently a hydrogen atom a hydrocarbon group which may be substituted a , hydroxy group which may be substituted a thiol group which may be , substituted an amino group which may be substituted an acyl group or a , halogen atom, a salt thereof or a prodrug thereof has steroid C17,20-lyase , inhibitory activity and are …
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 April 22, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 22, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2021.
- 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.