5h,10h-imidazo1,2-aindeno1,2-epyrazine-4-one derivatives, preparation thereof, intermediates thereof and drugs containing same
CA 2239254 A1 · Owner: Damour, Dominique · Inventors: Hardy, Jean-Claude; Manfre, Franco; Aloup, Jean-Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I), wherein R is a hydrogen atom or a -COOH -alk-COOH, -PO¿3?H¿2?, -CH¿2?-PO¿3?H¿2? or -CH=CH-COOH radical, or a phenyl radical substituted by a carboxy radical R¿1? is an alk-CN, -alk-COOH, -alk-Het alk-PO¿3?H¿2? or -alk-CO-NH-SO¿2?R¿2? radical R¿2? is an alkyl or phenyl radical, alk is an alkyl radical Het is a saturated or unsaturated mono- or polycyclic heterocyclic ring containing 1-9 carbon atoms and one or more heteroatoms selected from O S and N, said heterocyclic ring optionally being substituted by one or more alkyl phenyl or phenylalkyl radicals, with the proviso that when R is a hydrogen atom or a -COOH or -PO¿3?H¿2? radical R¿1? cannot be -alk-COOH, …
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 January 6, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 6, 2019.
- 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.