Ultra violet light resistant carbonate polymers with improved processing stability
CA 1314649 C · Owner: Ogoe, Samuel Abotar · Inventors: Ogoe, Samuel Abotar
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to ultra violet light resistant polycarbonate compositions which have processing or heat stability and which are produced by adding compatible UV absorbing compounds and aromatic sulfonimides to the compositions. The UV absorbing compounds are used in amounts of from 0.01 to 5.0 percent by weight and the sulfonimides are used in an amount of from 0.0001 to 10.0 percent. The preferred UV absorber is 2-(2'-hydroxy-5'-t-octylphenyl)-benzotriazole. The preferred sulfonimide is N-(p-tolylsulfonyl)-p-toluenesulfonimide. 35,768-F
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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
- Granted March 16, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 16, 2010.
- 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.