Chroman derivatives
CA 1340960 C · Owner: Bergmann, Rolf · Inventors: De Peyer, Jacques; Lues, Inge; Hausler, Gunther
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Chroman derivatives of the formula I, (see formula I) have an action on the cardiovascular system. In formula I R1 is alkyl having 1-6 carbon atoms and R2 is hydrogen or alkyl having 1-6 carbon atoms or R1 and R2 together form an alkylene group of 3-6 carbon atoms. R3 is OH or OAc, wherein Ac is formyl or alkanoyl of 2-6 carbon atoms or amyl having 7-11 carbon atoms and R4 is H, or R3 and R4 together form a bond. R5 is a nitrogen-containing heterocyclic group and R6 and R7 are hydrogen or a substituent, suitable substituents including hydroxy alkoxy, alkyl, formyl and alkanoyl.
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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
- Granted April 18, 2000. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 18, 2017.
- 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.