Polyalkylpiperidine derivatives of cyclic phosphites
CA 1291997 C · Owner: Ciba-Geigy Investments Ltd. · Inventors: Meier, Hans Rudolf; Hofmann, Peter; Dubs, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the formula I or II I, II, wherein m is 1 or 2, A is branched or unbranched 1,2- or 1,3-alkylene, or o-phenylene, B is a group III or IIIa R is, hydrogen or methyl, R1 and R3 are hydrogen alkyl, alkenyl, aralkyl, alkanoyl, alkenoyl benzoyl or cyanomethyl, R2 is, a radical of valency m and R4 is a monovalent radical are, effective processing stabilizers for polymers in particular, for polyolefins, and additionally have a stabilizing action against damage by light.
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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 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2008.
- 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.