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:
Jan. 16, 2007
Filed:
Jul. 01, 2003
Applicants:
Stuart Briggs, Edison, NJ (US);
Chin Chu, Westwood, NJ (US);
Inventors:
Stuart Briggs, Edison, NJ (US);
Chin Chu, Westwood, NJ (US);
Assignee:
Infineum International Limited, Oxfordshire, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10M 143/00 (2006.01); C08F 36/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A polymer suitable for use as a viscosity index improver for lubricating oil compositions, which is at least one, at least partially hydrogenated linear or star-shaped random copolymer of isoprene and butadiene, in which at least 70 wt. % of the butadiene is incorporated into the polymer as 1,4 units and the weight ratio of isoprene addition product to butadiene addition product in the copolymer is in a range of from about 90:10 to about 70:30.