Metal containing dispersant-viscosity improvers for lubricating oils
CA 2227353 A1 · Owner: The Lubrizol Corporation · Inventors: Lange, Richard M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition of matter suitable for use as a dispersant-viscosity improver for lubricating oil compositions comprises the reaction product of reactants comprising, (a) a hydrocarbon polymer grafted with an .alpha..beta.-ethylenically unsaturated carboxylic acid or functional derivative thereof; and (b) at least one nitrogen and metal containing derivative of a hydrocarbon substituted polycarboxylic acid or functional derivative thereof; and optionally (c) at least one hydroxyl-containing polyester containing at least one condensable free hydroxyl group.
Read the whole patent
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 January 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2020.
- 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.