Expired Canadian patentCanada
A method of improving the compatibility of an overbased detergent with other additives in a lubricating oil composition
CA 2551955 C · Owner: Adams, Christopher John · Inventors: Dowding, Peter John; Adams, Christopher John
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of improving the compatibility of an overbased detergent with other additives in a lubricating oil composition. The method includes the step of adding an oil-soluble hydrocarbyl sulphonic acid to the detergent.
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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, 2006 and granted December 31, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 13, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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 13, 2006
GrantedDecember 31, 2013
Term endedJuly 13, 2026
Patent numberCA 2551955 C
Classification (IPC)C10M135/10
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.