Alkaline earth metal sulphurised hydrocarbyl phenate containing additive concentrate, process for its production and use thereof
CA 2099071 A1 · Owner: Cane, Charles · Inventors: Cook, Stephen J.; O'Connor, Sean P.; Cane, Charles
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An additive concentrate composition having a TBN greater than 300 suitable for incorporation into a finished lubricating oil composition comprising:-, (I') a first alkaline earth metal sulphurised hydrocarbyl phenate and, (II') a lubricating oil, the first alkaline earth metal sulphurised hydrocarbyl phenate (I') being obtained by overbasing a second alkaline earth metal sulphurised hydrocarbyl phenate containing at least 4% by weight sulphur, or its precursors, in the presence of the lubricating oil (II'), the amount of the lubricating oil (II') being such that the ratio of the weight of the additive concentrate to the weight of the second alkaline earth metal sulphurised hydrocarbyl …
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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 June 23, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2015.
- 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
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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.