Piperidine compounds containing a tetrahydrofuran ring for use as stabilisers for organic materials
CA 2070256 A1 · Owner: Novartis Ag · Inventors: Scrima, Roberto; Zagnoni, Graziano
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel piperidine compounds containing a tetrahydrofuran ring for use as stabilisers for organic materials. Abstract of the Disclosure The present invention relates to novel tetramethylpiperidine compounds of the general formula (I), (I), in which X and Y are e.g. a group of the formula (IIa) or (IIb) , (IIa) (IIb), in which R1 and R2 are e.g. hydrogen or methyl. The said compounds are effective stabilisers for organic materials in particular synthetic, polymers, against the action of light heat and oxidation.
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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 2, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 2, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 2, 2014.
- 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.