Expired Canadian patentCanada
Lubricant composition
CA 2020558 C · Owner: Novartis Ag · Inventors: Evans, Samuel
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lubricants can be stabilized against oxidation by the addition of a) a sterically hindered amine and, b) a phenol of formula I (see formula I), wherein A, B and X are as defined in claim 1. It is preferred to use phenols of formula I which contain a thioether group.
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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 5, 1990 and granted November 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 5, 1990
GrantedNovember 6, 2001
Term endedJuly 5, 2010
Patent numberCA 2020558 C
Classification (IPC)C10M133/12 +2 more
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.