Inherently light- and heat-stabilized polyamides with improved wet fastness
CA 2323611 A1 · Owner: Hu, Harry Y. · Inventors: Neuberg, Rainer; Wilms, Axel; Hu, Harry Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for producing polyamides characterized in , that the polymerisation of starting monomers or starting oligomers is carried out in the presence of at least one compound of formula (I) where R is a , functional group R8 which has 1 to 4 identical or different amide-forming groups R7; R1 is H, C1-C20 alkyl, cycloalkyl benzyl, OR6 where R6 is H, C1-, C20 alkyl cycloalkyl, benzyl; R2, R3, R4, R5 independently of each other are C1-C10 alkyl; n is a natural number greater than 1 and the piperidine , derivatives linked to R are identical to or different from the substituents that is R1, R2, R3, R4 and R5. Said polyamides can be used to produce thread fibres, …
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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 March 18, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 18, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 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.