Lubricant compositions exhibiting extended oxidation stability
CA 2287726 C · Owner: Ethyl Petroleum Additives Limited · Inventors: Ryan, Helen Theresa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Use, in a lubricant composition comprising a hydraulic antiwear component and a base oil of an additive comprising an amine antioxidant and at least one additional antioxidant selected from ashless dithiocarbamate sulphurised olefin and phenolic, antioxidants to provide a lubricant having improved thermal and oxidation stability.
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 October 28, 1999 and granted July 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2021.
- 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.