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:
Nov. 10, 2009
Filed:
Jul. 26, 2004
Renee A. Eveland, Concord Township, Lake County, OH (US);
Frederick W. Koch, Willoughby Hills, OH (US);
Robert Ian Wilby, Chesterfield, GB;
Virginia A. Carrick, Chardon, OH (US);
William D. Abraham, Concord Township, Lake County, OH (US);
Gordon D. Lamb, Southend Bradfield, GB;
John K. Pudelski, Cleveland Heights, OH (US);
Renee A. Eveland, Concord Township, Lake County, OH (US);
Frederick W. Koch, Willoughby Hills, OH (US);
Robert Ian Wilby, Chesterfield, GB;
Virginia A. Carrick, Chardon, OH (US);
William D. Abraham, Concord Township, Lake County, OH (US);
Gordon D. Lamb, Southend Bradfield, GB;
John K. Pudelski, Cleveland Heights, OH (US);
The Lubrizol Corporation, Wickliffe, OH (US);
Abstract
A dispersant composition comprising the product of an amine, an alcohol, or an amino alcohol, with a hydrocarbyl-substituted succinic anhydride component exhibits improved viscosity stability and reduced chlorine content, when the hydrocarbyl-substituted succinic anhydride component comprises: (a) 10 to 95 weight percent of a component prepared by reacting a polyisobutylene with maleic anhydride in the presence of chlorine; and (b) 5 to 90 weight percent of a component prepared by reacting a polyisobutylene with maleic anhydride in the substantial absence of chlorine.