Ethylene-alpha-olefin polymers, processes and uses
CA 2479856 A1 · Owner: Pennzoil Products Company · Inventors: Chien, James C.W.; Heilman, William; I-Ching, Chiu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel series of copolymers and terpolymers useful, as base oils for synthetic lubricants are produced by, polymerization of ethylene an alpha-olefin, and, optionally a third monomer comprising an alpha-olefin of 3 to 20 carbon atoms, in the presence of a combination catalyst comprising a compound of a transition metal of Group IVb of the Periodic Table and an aluminoxane. The copolymer or terpolymer may be further processed by thermal cracking to yield novel cracked polymers and the, cracked polymers may be hydrogenated. The copolymers or terpolymers may also be hydroisomerized. All the polymers are useful as base oils for lubricating oils and consumer products.
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 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 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.