Fatty amine derivatives of butylated hydroxy toluene for the protection of surfaces from physical and chemical degradation
CA 2363543 C · Owner: Severns, John Cort · Inventors: Severns, John Cort; Sivik, Mark Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to novel antioxidant compounds to reduce the physical or chemical degradation or discoloration of surfaces especially the , fading of, a variety of surfaces from sunlight wherein the antioxidant compound is a derivative, of butylated hydroxytoluene or sorbic acid and is selected from the group consisting, of: (I), (II), (III), (IV) wherein each R1 and R3 is selected from the group consisting of, hydroxy, methoxy, ethoxy propoxy, butoxy, methyl, ethyl, propyl straight or, branched chained butyl groups straight or branched chained amyl groups and, mixtures thereof; R2 is a hydroxy group; each R4 and R7 is selected from the group, consisting of a saturated or …
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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
- Filed July 13, 1995 and granted November 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 2017.
- 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
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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.