Reduced power consumption low battery alert device
Patent 4660027 Issued on April 21, 1987. Estimated Expiration Date: 
August 31, 2004. 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.
August 31, 2004. 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 3475061 3568175 3877001 Self-testing battery discharge indicator Battery backup system Electrical device with bi-level battery state-of-charge indicator Voltage indicating arrangement for a radio transceiver Low battery voltage indicator circuit for a metal detector Low charge detector Indicating system Patent #: 4574276 InventorAssigneeApplicationNo. 06/646618 filed on 08/31/1984US Classes:340/636.15, By voltage324/433, To compare battery voltage with a reference voltage324/435, Having particular meter scale or indicator340/661, Comparison340/691.8Control circuit detailExaminersPrimary: Rowland, James L.Assistant: Hofsass, Jeffery Attorney, Agent or FirmInternational ClassesG08B 21/00 (20060101)G08B 21/20 (20060101) AbstractA reduced power consumption low battery indicator comprising in the preferred embodiment a transducer driver which drives a transducer to provide an audible alert. A microprocessor is used to generate a squarewave signal to power the transducer driver whenever the battery is depleted to a first predetermined level. A first low battery sensor is used to determine when the battery is depleted to the first predetermined level and generates a signal which is directed to the microprocessor to commence generation of the signal to drive the transducer driver. A second low battery sensor is used to determine when the battery is depleted to a second predetermined level and generates an output signal which is directed to the transducer driver which then drives the transducer at a lower power consumption rate. | |
