Hindered silicon ester stabilizers
CA 1307286 C · Owner: Ciba-Geigy Ag · Inventors: Pastor, Stephen D.; Spivack, John D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case 3-15499/=/CGC 1149, HINDERED SILICON ESTER STABILIZERS Abstract of the Disclosure, Compounds of the formulae I and II (I), (II), wherein R1, R2, R3, R4 and R5 are independently hydrogen alkyl or 1 to 18 carbon atoms, cycloalkyl of 5 to 8 carbon atoms, phenyl, phenyl substituted by alkyl of 1 to 18 carbon atoms, aralykyl of 7 to 9 carbon atoms or said aralykyl substituted by alkyl of 1 to 12 carbon atoms 2 21489-6979, R6 and R7 are independently alkyl having 1 to 30 carbon atoms, cycloalkyl of 5 to 8 carbon atoms phenyl, phenyl, substituted by alkyl of 1 to 18 carbon atoms aralkyl of 7 to 9, carbon atoms or said aralkyl substituted by alkyl of 1 to 12 carbon atoms; A is a direct bond, a …
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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 September 8, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 8, 2009.
- 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.