Lubricating oil additives
CA 2376637 A1 · Owner: Shanklin, James R. Jr. · Inventors: Mathur, Naresh C.; Shanklin, James R. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition, comprising from about 20% to about 80% by weight of a diluent prepared by reacting a mixture comprising: (A) an esterified carboxycontaining interpolymer, said interpolymer being derived from at least two monomers, (i) one of said monomers being at least one of an aliphatic olefin containing from 2 to about 30 carbon atoms and a vinyl aromatic monomer and (ii) the other of said monomers being at least one alpha beta unsaturated , acylating agent, and having before esterification, Mn determined by gel permeation chromatography ranging from about 8,000 to about 350,000 wherein , from about 80% to about 99% of the carboxylic groups of said interpolymer are esterified, …
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 June 6, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 6, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2022.
- 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.