Piperidine-triazine co-oligomers for use as stabilizers for organic materials
CA 2044310 C · Owner: Ciba-Geigy Ag · Inventors: Carrozza, Primo; Borzatta, Valerio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to novel co-oligomers containing recurring units of the, formulae (Ia} and (Ib), (see formula I) (see formula II), which have a molecular weight of e.g. from 1,000 to 5,000 and a (Ia):(Ib) ratio of e.g. 1:1, and in which R1 and R5 are e.g. N-(2,2,6,6-tetramethyl-4-piperidyl)-nbutylamino, R2 is, e.g. 2,2,6,6-tetramethyl-4-piperidyl R3 is e.g. hexamethylene, R4 is e.g. , hydrogen and X is e.g, a group (see formula III), These compounds are particularly suitable for stabilizing organic materials against light, heat and oxidation.
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 June 11, 1991 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 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.