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US Patent 4603581 - Sensing apparatus
US Patent Issued on August 5, 1986
Estimated Patent Expiration Date:
January 31, 2005Estimated 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.
Estimated Patent Expiration Date:
January 31, 2005Estimated 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.AbstractA sensing apparatus including: a first electrode member; a second electrode member arranged at opposing positions a predetermined distance away and electrically isolated from the first electrode member; and an electric circuit connected to the first and second electrode members. The first and the second electrode members are operatively connected by an impedance formed between the first and the second electrode members in response to existence of a substance to be sensed between the first and the second electrode members. The electric circuit outputs a signal in response to the impedance. The sensing apparatus is applicable for detecting, for example, the level of a liquid in a vessel. | InventorsAssigneeApplicationNo. 06/697005 filed on 01/31/1985US Classes:73/304C, Capacitative340/620, Electrode probe361/284Liquid levelExaminersPrimary: Frankfort, Charles E.Assistant: Will, Thomas B. Attorney, Agent or FirmUS Patent References2644050, 2996915, 3553575, 3986110, Water depth measuring deviceIssued on: 10/12/1976 Inventor: Overall , et al.4092860, Level measurement and control Issued on: 06/06/1978 Inventor: Arts, et al.4099167, Capacitive means for measuring the level of a liquid Issued on: 07/04/1978 Inventor: Pomerantz , et al.4142415, Device for continuously measuring the liquid level in a container Issued on: 03/06/1979 Inventor: Jung , et al.4145927, Apparatus for determining the liquid level in a tank Issued on: 03/27/1979 Inventor: Larson4201085, Apparatus for determining the liquid level in a tank Issued on: 05/06/1980 Inventor: Larson4295370, Capacitive scheme for measuring the level of a liquid Issued on: 10/20/1981 Inventor: Bristol4316158, R-C Oscillators using plural inverters Issued on: 02/16/1982 Inventor: Akita , et al.4479116Capacitive type fuel level and impurity indicator Issued on: 10/23/1984 Inventor: Kobayashi International ClassesG01F 23/26 (20060101)G01F 23/22 (20060101) Foreign Application Priority Data1984-02-14 JP |
