Low viscosity aromatic carbonate lubricating oil concentrates
CA 2035934 A1 · Owner: Ladwig, Paul K. · Inventors: Shaw, Gerald; Ladwig, Paul K.; Shaw, Gerald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to the present invention a process is, provided for forming a lubricating oil concentrate containing aromatic carbonate which comprises admixing lubricating oil, aromatic carbonate and at least one aromatic carbonate solubilizing co-additive of the formula: wherein R1 is Cl to C20 substituted or unsubstituted hydrocarbyl, Ar is C6 to C20 aromatic group and Z1, is a member selected from the group consisting of -(O)COR2, -N(R3)-T2, -X-Tl, and -Dl-T3 wherein R2 is H or Cl to C20 hydrocarbyl, R3 is H or C1 to C6 hydrocarbyl, T2 is substituted or unsubstituted aryl, X is O or S, Tl is a group of the formula: wherein Ar' is C6 to C20 aromatic group Z2 is, divalant C1 to C10 a1ky1ene or …
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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 February 7, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2013.
- 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.