Multifunctional viscosity index improver derived from amido-amine and degraded ethylene copolymer exhibiting improved low temperature viscometric properties
CA 2026184 C · Owner: Exxon Chemical Patents Inc. · Inventors: Struglinski, Mark Joseph; Chung, David Yen-Lung; Gutierrez, Antonio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Composition of matter useful as multifunctional viscosity index improver for lubricating oil comprising reaction product of:, (i) (a) degraded ethylene-alpha-olefin copolymer obtained by degrading copolymer of, ethylene and at least one other alpha-olefin monomer, said copolymer, comprising intramolecularly heterogeneous copolymer chains containing at least one crystallizable segment of methylene units and at least one low crystallinity, ethylene-alpha-olefin copolymer segment wherein said at least one crystallizable segment comprises at least about 10, weight percent of said copolymer chain and contains at least about 57 weight, percent ethylene wherein said low, crystallinity segment …
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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 September 25, 1990 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 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.
Timeline
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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.