Lubricating base oil compositions
CA 1185962 A · Owner: Shell Canada Limited · Inventors: Bijwaard, Henricus M.J.; Morcus, Alphonsus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lubricating base oil compositions containing: (a) a lubricating base oil prepared from a vacuum distillate a, deasphalted vacuum residue or a mixture thereof by applying, to it a severe catalytic hydrotreatment if desired, in, combination with a solvent extraction and, (b) 0.01-20%w of an oil prepared from a vacuum distillate a, deasphalted vacuum residue or a mixture thereof by applying, to it a combination of a mild catalytic hydrotreatment and a solvent extraction, show improved oxidation and daylight stability.
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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
- Granted April 23, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 23, 2002.
- 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.