Ultraviolet stabilizer for polycarbonate compositions
CA 2057262 A1 · Owner: Mobay Corporation · Inventors: Krishnan, Sivaram; Jorissen, Steven A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo-3522, PC-245, AN ULTRAVIOLET STABILIZER FOR POLYCARBONATE COMPOSITIONS ABSTRACT OF THE DISCLOSURE, A thermoplastic molding composition comprising a polycarbonate resin and a benzotriazole ortho carbonate having an improved level of resistance to deterioration caused by exposure to ultraviolet radiation is disclosed. The ultraviolet stabilizer of the invention conforms to (I), or, (II), wherein, R1 denotes a hydrogen or a halogen atom or a C1-4 alkyl or alkoxy group, R2 and R3 independently represent a hydrogen atom ,a C1-12 alkyl, a C1-4 alkoxy group, a phenyl or a phenoxy radical and, R4 denotes a C1-12 alkylene or a C6-30 arylene group. The composition is suitable for the preparation …
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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 December 9, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 2013.
- 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.