Fuel-economy lubrication-effective engine oil composition
CA 2272122 A1 · Owner: Exxon Research And Engineering Company · Inventors: Steigerwald, Edgar Andreas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lubricant compositions suitable for use in automative engines especially , internal combustion engines the lubricant having a kinematic viscosity at 100 ~C of less than 12.5 mm2/s and a high temperature high shear dynamic , viscosity (i.e. at a temperature of 150 ~C and a shear rate of 106/s) of at least 2.9 mPa.s, and comprising (a) 70 to 99.5 wt.% of a base oil preferably , a mixture of poly-alpha-olefin and ester having a kinematic viscosity at 100 , ~C of 2 to 8 mm2/s and a viscosity index of at least 120 and (b) 0.5 to 3 , wt.% of an alkenylarene-conjugated diene copolymer preferably , styrene/butadiene copolymer as a viscosity index improver. The lubricant provides an improvement …
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 November 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2019.
- 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.