Fuel products
Patent 4804389 Issued on February 14, 1989. Estimated Expiration Date: 
December 1, 2007. 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.
December 1, 2007. 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. 07/095484 filed on 12/01/1987US Classes:44/403, Plural -C(=O)O- groups attached to each other directly or indirectly by nonionic bonding44/347Acyclic chalcogen bonded directly to each carbon adjacent to the ring nitrogen (e.g., succinimides, etc.)ExaminersPrimary: Dixon, William R. Jr.Assistant: Hunter, James M. Jr. Attorney, Agent or FirmInternational ClassesC10L 1/10 (20060101)C10L 1/14 (20060101) C10L 1/30 (20060101) C10L 1/26 (20060101) C10L 1/16 (20060101) C10L 1/22 (20060101) C10L 1/18 (20060101) C10L 1/24 (20060101) C10L 1/28 (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 gallon of fuel is described. The fuel provides acceptable valve seat protection in engines designed to operate on leaded or unleaded fuels. Ordinarily, leaded fuels contain components to reduce deposits within the engine cylinders which unleaded fuels do not. As leaded fuels become unavailable, some refiners will add valve protecting components to the unleaded fuels to satisfy the leaded market. Such fuels will then potentially cause an increase in the octane requirement. This invention deals with polybasic carboxylate additives having valve seat protection properties which avoid or minimize the octane requirement increase. | |
