The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1999
Filed:
Feb. 19, 1997
Hidehiko Matsuya, Kyoto, JP;
Koji Takeuchi, Kyoto, JP;
Sanyo Chemical Industries, Ltd., Kyoto, JP;
Abstract
Disclosed are a viscosity index improver which comprises a copolymer (A) consisting essentially of an alkyl methacrylate (a1), and one or more monomers (a2) selected from the group of conjugated dienes, acetylene, substituted acetylene, alkyl vinyl ethers and alkyl allyl ethers; an engine lubricant composition comprising said viscosity index improver and base oil; and a concentrate comprising an increased amount of said viscosity index improver and base oil. The viscosity index improver gives reduced amounts of coked products, while improving the fuel-related performance characteristics of cars that use the engine lubricant composition comprising the improver.