Lubricating oil additives
CA 1096366 A · Owner: Rohm G.M.B.H. · Inventors: Jost, Heinz; Schodel, Ulrich; Wenzel, Franz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is known to add polymethacrylates and other polyolefins to lubricating oils to improve their temperature-viscosity properties and lower their pour point. However, the effective treatment with polymethacrylates is expensive and polyolefin additives do not lower the pour point. The present invention seeks to overcome these drawbacks by providing a process for the preparation of lubricating oil additives which additives comprise a solution, in a lubricating oil of a polymer composition prepared from (A) at least one olefin selected from ethylene, prolylene butylene and isobutylene, and (B), at least one methacrylate ester wherein the alcohol moiety contains 8 to 18 carbon atoms and, if …
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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 February 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 24, 1998.
- 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.