Fuel compositions for lessening valve seat recession
Patent 4659338 Issued on April 21, 1987. Estimated Expiration Date: 
August 16, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 16, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 06/766615 filed on 08/16/1985US Classes:44/347, Acyclic chalcogen bonded directly to each carbon adjacent to the ring nitrogen (e.g., succinimides, etc.)44/370, Containing organic -S(=O)(=O)O- compound (i.e., sulfonates)44/385, Containing organic -C(=O)O- compound (e.g., fatty acids, etc.)44/409, Plural nitrogens in the organic nitrogen compound (e.g., diamines, aminoamides, guanidines, etc.)44/419, Additional nitrogen attached indirectly to the -C(=X)- group by acyclic nonionic bonding44/421Plural nitrogens attached indirectly to each other by acyclic nonionic bondingExaminersPrimary: Harris-Smith, Mrs. Y.Attorney, Agent or FirmInternational ClassesC10L 1/10 (20060101)C10L 1/14 (20060101) C10L 1/30 (20060101) C10L 1/16 (20060101) C10L 1/26 (20060101) C10L 1/18 (20060101) C10L 1/24 (20060101) C10L 1/28 (20060101) C10L 1/22 (20060101) C10L 1/20 (20060101) AbstractA fuel composition for internal combustion engines, and more particularly, a fuel composition for internal combustion engines containing less than about 0.5 gram of lead per liter of fuel is described. The fuel composition comprises a major amount of a liquid hydrocarbon fuel and a minor, property improving amount of(A) at least one hydrocarbon-soluble alkali or alkaline earth metal-containing composition, and(B) at least one hydrocarbon-soluble ashless dispersant.When a mixture of the metal-containing composition (A) and the ashless dispersant (B) are incorporated into gasolines containing less than about 0.5 gram of lead per liter of fuel, the treated fuel exhibits improved stability and water tolerance, and when the unleaded or low lead-containing fuels of the present invention are utilized in internal combustion engines, there is a significant reduction in valve seat recession. Methods of reducing valve seat recession in internal combustion engines utilizing lead free or low lead-containing fuels also are described.Other References
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