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:
Dec. 09, 2008
Filed:
Jun. 05, 2003
Melody A. Wilk, Timberlake, OH (US);
William B. Chamberlin, Iii, Kirtland, OH (US);
Jack C. Kelley, Chagrin Falls, OH (US);
William D. Abraham, Concord Township, OH (US);
Melody A. Wilk, Timberlake, OH (US);
William B. Chamberlin, III, Kirtland, OH (US);
Jack C. Kelley, Chagrin Falls, OH (US);
William D. Abraham, Concord Township, OH (US);
The Lubrizol Corporation, Wickliffe, OH (US);
Abstract
Internal combustion engines exhibit improved efficiency of the emissions control system by using a lubricating oil composition of a base oil, an alkali or alkaline earth metal-containing detergent; a metal salt of one or more phosphorus-containing compounds represented by the formula (I), wherein Xand Xare independently O or S, and Rand Rare independently hydrocarbyl groups, the average total number of carbon atoms in Rand Rfor the one or more phosphorus-containing compounds being at least 10.4; and an acylated nitrogen-containing compound having at least about 10 alphatic carbon atoms and a TBN of at least about 2; the lubricating oil composition being characterized by a phosphorus concentration of up to about 0.12% by weight and the substantial absence of copper, thereby generating a lean-phosphorus containing exhaust gas.