Capacitive type fuel level and impurity indicator
Patent 4479116 Issued on October 23, 1984. Estimated Expiration Date: 
August 16, 2002. 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, 2002. 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 ReferencesApparatus for capacitive filling-level measuring, particularly in a motor vehicle tank Liquid quantity measuring apparatus Patent #: 4434657 InventorApplicationNo. 06/408704 filed on 08/16/1982US Classes:340/620, Electrode probe73/304C, Capacitative73/61.43, Liquid constituent of a liquid mixture73/61.61Detector detailExaminersPrimary: Caldwell, Sr., John W.Assistant: Kovalick, Vincent E. Attorney, Agent or FirmInternational ClassesG01F 23/26 (20060101)G01N 27/22 (20060101) G01F 23/22 (20060101) Foreign Application Priority Data1981-08-27 JPAbstractA pump located within the fuel tank discharges fuel into a chamber containing a plurality of reference electrodes which determine the dielectric constant of the fuel. The output of a set of measuring electrodes is calibrated using the dielectric constant determined using the reference electrodes. The fluctuations in the capacitance developed by the reference electrodes due to momentary contact with water droplets or the like can be used to indicate an excess of the water or the like in the fuel.Other References
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