Method for stabilizing synthetic thermoplastic materials against thermal degradation
CA 2044308 A1 · Owner: Ciba-Geigy Ag · Inventors: Scrima, Roberto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for stabilizing synthetic thermoplastic materials against thermal degradation Abstract of the disclosure, The present inveneion relates to a novel method for stabilizing synthetic thermoplastic materials against thermal degradation, which comprises incorporating in said materials one or more compounds of the formula (I) (I), in which R1 is unsubstieuted or substituted phenyl n is e.g. 1, 2 or 3, and, when n is 1, R2 is e.g. -COR3, - COOR4 or -CO-N(R5)R6 in which R3 is e.g. C4-Cl7alkyl R4 is e.g. C4-Cl8alkyl, cyclohexyl or t-butylcyclohexyl R5 and R6 which can be identical or, different are e.g. C2-C8alkyl or cyclohexyl and, when n is 2, R2 is e.g. -CO-R10-OC -COO-R11-OOC- or …
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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
- Filed June 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have 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.