3-amino-dihydropyridines, a process for their preparation, and their use in medicaments
CA 1283106 C · Owner: Thomas, Gunter · Inventors: Heiker, Fred Robert; Kayser, Michael; Stoltefuss, Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel cardioactive compounds of the formula in which, R1 is alkyl, aryl or heterocyclic preferably, substituted phenyl, R2 is alkyl preferably methyl, R3 is hydrogen, halogen acyloxy or alkyl, preferably hydrogen, and R4 is phenyl, carbalkoxy or together with R3 forms a ring, preferably carbalkoxy are produced by reducing the corresponding nitro compounds.
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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 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2008.
- 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.