2,4-dimethyl-6-s-alkylphenols
CA 2020051 C · Owner: Novartis Ag · Inventors: Dubs, Paul; Pitteloud, Rita
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition containing a) a polystyrene substituted polystyrene, copolymer or terpolymer of styrene or of a substituted styrene, polycarbonate polyester-carbonate, polyurethane, polyamide copolyamide, polyacetal or, polyphenylene oxide and b) at least one compound of the formula I, (see formula I), In which R1 is methyl or ethyl and R2 is C2-C30 alkyl. Compounds of the formula I in which R2 is C8-C30 alkyl are novel and are suitable for stabilizing organic materials against thermal, oxidative and actinic degradation.
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 28, 1990 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2012.
- 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.