Stabiliser mixtures for elastomers
CA 2042859 C · Owner: Knobloch, Gerrit · Inventors: Knobloch, Gerrit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition Comprising an elastomer and a stabiliser mixture consisting of a) at least one phenol of formula, wherein R a and R b are each independently of the other C1-C4alkyl and R c is C6-C12alkyl, and, b) at least one phenol of formula II wherein n is 0 to 3, R1 and R2 are each independently of the other C1-C12alkyl or -CH2SR3 R3 is C8-, C18alkyl, phenyl or benzyl, and R4 is hydrogen or methyl.
Read the whole patent
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 May 17, 1991 and granted November 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 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.