Lubricating oil composition
CA 2079152 C · Owner: Kaya, Hidenori · Inventors: Mizui, Kinya; Takahata, Kazunori; Tanaka, Masahide
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The first lubricating oil composition of the present invention is a composition comprising a polycarbonate represented by the following general formula at least one, compound as an essential component selected from the group consisting of epoxy compounds, phenol compounds sulfur, compounds and amine compounds, and a triester phosphite compound and a triester phosphate compound as an optical component. R1OCOO(R2O)pCOOnR3, wherein R1 and R3 are each independently a specific hydrocarbon group or a specific hydrocarbon group containing an ether bond, R2 is a specific alkylene group and p and n are specific integers. The lubricating oil compositions are excellent in lubricating properties, …
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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 September 25, 1992 and granted February 17, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 25, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2014.
- 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.