Substituted 3-thia- and 3-oxa-alkylflavones, a process for their preparation, the use thereof, medicaments based on these compounds and intermediates
CA 2039909 C · Owner: Hoechst Aktiengesellschaft · Inventors: Granzer, Ernold; Beck, Gerhard; Kesseler, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substituted 3-thia- and 3-oxa-alkylflavones of formula I (see formula I), wherein R, R1, R2, R3 R4, X, m and n have the indicated, meanings a process for the preparation of these compounds and their use as medicaments and pharmaceutical preparations are described. In addition new inter-, mediates for the preparation of the compounds of formula I are described.
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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 April 5, 1991 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 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.