Plural comparator indicator of battery voltage
Patent 4020414 Issued on April 26, 1977. Estimated Expiration Date: 
April 26, 1994. 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.
April 26, 1994. 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 2745090 2991413 3796951 InventorAssigneeApplicationNo. 05/546099 filed on 01/31/1975US Classes:324/433, To compare battery voltage with a reference voltage320/136, With battery or cell condition monitoring (e.g., for protection from overcharging, heating, etc.)324/133, Nonquantitative (e.g., hot-line indicator, polarity tester)340/636.15, By voltage340/663UndervoltageExaminersPrimary: Rolinec, Rudolph V.Assistant: Tokar, Michael Attorney, Agent or FirmInternational ClassG01R 31/36 (20060101)AbstractA battery status indicator for use with a DC battery to provide an indication of the battery's ability to provide a necessary amount of charge and is especially useful in a vehicular electrical system using a DC battery. The system is characterized by using miniaturized integrated circuitry for reduced size and increased reliability of operation and includes a single package quad comparator in conjunction with a scaling network of resistors to show very small voltage changes to a network of indicators such as a lightbulb and alarm system. The system is capable of showing in a step-by-step sequence the progressional deterioration in the voltage level of the battery such that it allows one to continuously monitor the status of the battery prior to its becoming inoperable.Other References
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