Phenols and use thereof as stabilisers
CA 1263409 C · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Rosenberger, Siegfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Phenols and use thereof as stabilisers Abstract of the Disclosure, The invention relates to phenols which contain a number of aromatic nuclei and in which the bridge formation of these nuclei is in the meta-position to the OH groups. These phenols have the formula I (I) , or, (VI), wherein R1, R2, R3, R4 A and n are as defined in claim 1. The novel phenols are most suitable for use as stabilisers for organic polymers and lubricants and have particularly good colour properties.
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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 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 28, 2006.
- 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.