Apparatus for determining the liquid level in a tank
Patent 4201085 Issued on May 6, 1980. Estimated Expiration Date: 
December 14, 1998. 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 14, 1998. 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 3588859 Liquid level sensor and electrode assembly therefor Level detector using oscillator circuit with two capacitive probes Patent #: 4002996 InventorApplicationNo. 05/969334 filed on 12/14/1978US Classes:73/304C, Capacitative361/284Liquid levelExaminersPrimary: Woodiel, Donald O.Attorney, Agent or FirmInternational ClassesG01F 23/22 (20060101)G01F 23/26 (20060101) AbstractApparatus for determining the liquid level in tanks, such as are used in recreational vehicles, which utilizes a pair of parallel plates secured to the outside of the tank to avoid contact with the liquid inside of the tank. The plates have a generally vertical orientation so that as the liquid rises in the tank, an increasing area of the plates is adjacent to the liquid. The change in capacitance between the plates as a function of liquid level is utilized to generate an electrical signal indicative of liquid level. The problems caused by highly viscous liquids coating the inside surface of the tank and yielding false readings are solved by utilizing a high frequency driving signal. | |
