Liquid level sensing device and methods of making and operating the same
Patent 5144835 Issued on September 8, 1992. Estimated Expiration Date: 
July 12, 2011. 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.
July 12, 2011. 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 3073160 3376746 3533286 3596517 3620080 Golf club swing-weighting method Washer fluid monitor Liquid level sensing device and methods of making an operating the same Patent #: 5050431 InventorAssigneeApplicationNo. 729495 filed on 07/12/1991US Classes:73/304C, Capacitative68/207, Liquid supply or vapor supply to liquid340/620, Electrode probe361/284Liquid levelExaminersPrimary: Cuchlinski, William A. Jr.Assistant: Bennett, G. Bradley Attorney, Agent or FirmForeign Patent References
International ClassG01F 023/26AbstractA liquid level sensing device for determining the level of a liquid in a liquid confining unit, methods of making and operating the device and a laundry machine using the device are provided, the device comprising a pair of electrode plates disposed in spaced apart relation so as to be adapted to be in a certain position relative to the confining unit and having opposed ends, an electrical circuit connected to the electrode plates for creating a voltage signal therefrom that varies in relation to the level of the liquid in the confining unit relative to the electrode plates, a control for determining the actual level of the liquid from the signal, and a third electrode plate disposed in spaced apart relation to the pair of electrode plates and being adapted to cooperate with one of the pair of electrode plates to provide a reference voltage signal to determine the electrolytic base of the liquid. | |
