Isoindolinone compounds as stabilisers for organic materials
CA 2040195 A1 · Owner: Ciba-Geigy Ag · Inventors: Nesvadba, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A-18035/A, Isoindolinone compounds as stabilisers for organic materials Abstract, Compositions comprising an organic material liable to thermal oxidative and/or actinic, degradation and at least one compound of the formula (I) (I), are described in which R is hydrogen C1-C18alkyl, C1-C18alkoxy, halogen, nitro,phenyl-C1-C4alkoxy C2-C18alkanoyl, benzoyl, (C1-C6alkyl)benzoyl C1C18alkenoyl,-N(R7)(R7a), -OH or -CO-A R1 has the same possibilities of meaning as R R2 is hydrogen, or C1-C4alkyl and R3 is hydrogen or halogen A is hydroxyl, C1-C18alkoxy, C5-C12cycloalkoxy benzyloxy or benzyloxy substituted by C1-C4alkyl and/or halogen -N(R7)(R7a), -NH-NH-R8 or leads to ditri- or tetrameric ring …
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 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 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.