Inherently light- and heat-stabilized polyamide and method of making the same
CA 2320338 A1 · Owner: Ilg, Otto · Inventors: Ilg, Otto; Julius, Manfred; Breiner, Ulrike
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inherently light- and heat-stabilized polyamide is prepared by polymerizing polyamide forming monomers in the presence of (a) an effective amount of at least one 4-carboxy-2,2,6,6-tetramethylpiperidine compound represented by formula (I): wherein R1 is hydrogen, benzyl or a C1-C20 alkyl; R2-R5 are each , hydrogen or the same or a different C1-C6 alkyl; X has n free valance bonding sites and is an alkyl or substituted alkyl having from about 1 to about 30 carbon atoms or an aryl or substituted aryl having from about 6 to about 20 carbon atoms; m is 0 or 1; -C(O)-R6 is a group that can form an amide bond together with an amine, and n is equal to 1 2 or 3 and (b) an effective , …
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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 February 12, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 12, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2021.
- 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.