Novel vi enhancing compositions and newtonian lube blends
CA 2031492 C · Owner: Wu, Margaret M. · Inventors: Pelrine, Bruce P.; Jackson, Andrew; Chu, Alice S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel composition is disclosed that is particularly useful as a lubricant viscosity index improver. The composition comprises branched C30-C10000 hydrocarbons that have a branch ratio of less than 0.19 and viscosity at 100° C between 725 mm2/s and 15,000 mm2/s. The novel compositions comprise the product of the oligomerization of C6 to C20 alpha-olefin feedstock, or mixtures thereof, under oligomerization conditions at a temperature between -20° C and + 90°C in contact with a reduced valence state Group VIB metal catalyst on porous support. The compositions have viscosities at 100°C between 725 mm2/s and 15,000 mm2-/s. Using the foregoing compositions in admixture with mineral oil …
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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 April 24, 1990 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 24, 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.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.