Patents Represented by Attorney John R. Sieberth

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  • Lubricating oil composition
    Patent number: 5164102
    Abstract: Engine wear and sludge are reduced by using in the engine crankcase a formulated motor oil containing a small amount of the combination of (i) an overbased alkaline earth metal sulfonate having a total base number of at least 100, (ii) a zinc dihydrocarbyl dithiophosphate, (iii) a sulfurized carboxylic acid ester, and (iv) a sulfurized fatty acid amide, ester or ester-amide of an oxyalkylated amine or mixtures thereof.
    Type: Grant
    Filed: August 3, 1990
    Date of Patent: November 17, 1992
    Assignee: Ethyl Petroleum Additives, Inc.
    Inventors: Armgard K. Everett, Edmund F. Perozzi