Material level indicator
September 1, 2009. 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 References 3485100 3588859 Liquid level gauging apparatus Methods of and means for measuring liquid flow Fluid measuring system Device for the electric monitoring of the level of a liquid contained in a container Liquid level scale changeover measuring apparatus Device for electrically monitoring the level of a liquid present in a container Capacitance-type material level indicator Thermoelectric level detector and a method for its manufacture InventorApplicationNo. 085377 filed on 08/14/1987US Classes:73/304C, Capacitative338/38, Liquid resistance element or contact361/284Liquid levelExaminersPrimary: Will, Thomas B.Attorney, Agent or FirmForeign Patent References
International ClassG01F 023/26AbstractA system for indicating level of material in a vessel comprising a probe which includes a plurality of electrically discrete probe elements of electrically conductive construction position within a material vessel in a spaced array extending height-wise of the vessel. Each probe element has electrical characteristics which vary as a function of proximity of material thereto within the vessel. In one embodiment, the probe elements comprise capacitive elements responsive to varying dielectric characteristics as material approaches each element. In another embodiment, having particularly utility in fuel level sensing applications, the probe elements comprise resistance elements responsive to cooling through immersion in fuel for varying voltage drop thereacross. Electonic circuitry is coupled to the several probe elements for detecting material level as a function of electrical characteristics of the probe elements. Preferably, such level detection is accomplished in discrete steps corresponding to separation between probe elements.Other References
Field of SearchCapacitativeImmersible electrode type Thermal type Having heat sensor Liquid level Liquid contact or element Liquid resistance element or contact Element forms a coating PLURAL RESISTANCE ELEMENTS CONNECTED BY A JUMPER OR SPACER Element includes conductive jumpers or spacers Element includes conductive jumpers or spacers Liquid resistance element or contact Surfaces pressed together (e.g., compressible type) Deformable Liquid resistance element circulates WITH LIQUID ELEMENT | |
