2-(2-hydroxyphenyl)-benztriazoles, their use as uv- absorbers and their preparation
CA 1197246 A · Owner: Ciba-Geigy Investments Ltd. · Inventors: Slongo, Mario; Rody, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2-(2-Hydroxyphenyl)-benztriazoles, their use as UVabsorbers and their preparation, Abstract The novel UV-absorbers are compounds of the formula I, (I), in which R1 is, for example, hydrogen n is one of the, numbers 1 or 2 and R2 is an appropriate monovalent or divalent radical, for example -OH or -O-CH2CH2-O-. The UV-absorbers are used in particular for stabilising and improving lacquers and photographic material.
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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 November 26, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 26, 2002.
- 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.