Process for incorporating o-hydroxyphenyl-s-triazines in organic polymers
CA 2032669 C · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Birbaum, Jean-Luc; Valet, Andreas; Rody, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
o-Hydroxyohenyl-s-triazines containing suitable functional groups are incorporated in, polymers by copolymerisation copolycondensacion, copolyaddition or by polymer-analogous reaction. The modified polymers so obtained have excellent stability, to degradation induced by light oxygen and heat. They can also be used as stabilisers.
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 December 19, 1990 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 19, 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.