1
Eugene P Finger: Method and means for adjusting battery monitor based on rate of current drawn from the battery. Curtis Instruments, John H Crozier, September 19, 1995: US05451881 (155 worldwide citation)

In a preferred embodiment, a metering system for measuring and indicating the state of charge of an electrical storage battery, including: apparatus for storing a numerical value indicative of the state of charge of the battery and for providing an output voltage signal representative thereof; appar ...


2
Eugene P Finger: Quiescent battery testing method and apparatus. Curtis Instruments, Curtis Ailes, April 30, 1985: US04514694 (145 worldwide citation)

The invention relates to apparatus for determining the state of charge of electric storage batteries.


3
Eugene P Finger, Edward M Marwell: Battery control system for battery operated vehicles. Curtis Instruments, Pennie & Edmonds, March 15, 1977: US04012681 (120 worldwide citation)

A system is disclosed for monitoring the state of charge of batteries in a fleet of electrically powered vehicles. Each battery has associated with it an integrator module which registers both the depletion and charging of the battery. While the battery is in use in the vehicle, a portion of the cur ...


4
Eugene P Finger, Eugene A Sands: Method and apparatus for measuring the state of charge of a battery by monitoring reductions in voltage. Curtis Instruments, Pennie and Edmonds, March 11, 1980: US04193026 (88 worldwide citation)

A method and apparatus are disclosed for measuring the state of charge of a battery. The apparatus comprises threshold means for sensing reductions below a threshold level in the output terminal voltage of the battery and for producing a signal in response thereto and means for integrating said sign ...


5
Eugene P Finger: Battery state of charge metering method and apparatus. Curtis Instruments, Curtis Ailes, December 24, 1985: US04560937 (58 worldwide citation)

The system includes a digital integrator having a plurality of digital stages operable to store a numerical value in binary digital form which is indicative of state of charge. A switching circuit is provided for generating a series of voltage pulses on a single output line with each pulse correspon ...


6
Eugene P Finger: Battery state of charge indicator operating on bidirectional integrations of terminal voltage. Curtis Instruments, Curtis Ailes, June 14, 1983: US04388618 (35 worldwide citation)

Battery terminal voltage is measured on a continuing basis during both positive and negative voltage excursions with relation to a summed reference value to obtain a measured difference. The resultant measured difference causes the generation of convergence function signals which vary dependent upon ...


7
Eugene P Finger: Apparatus for measuring battery depletion by monitoring reductions in voltage. Curtis Instruments, Pennie & Edmonds, April 12, 1977: US04017724 (34 worldwide citation)

The apparatus comprises means for sensing reductions in the output terminal voltage of the battery due to varying load conditions and producing a signal in response thereto during the time that the terminal voltage is below a threshold value. The apparatus further comprises integrator means such as ...


8
Eugene P Finger: Quiescent voltage sampling battery state of charge meter. Curtis Instruments, Curtis Ailes, July 17, 1984: US04460870 (34 worldwide citation)

State of charge is determined for a battery during a quiescent interval with substantially no current flow through the battery by determining the quiescent time interval since the last substantial current flow through the battery, taking a rapid measurement of the battery terminal voltage, and relat ...


9
Eugene P Finger: Bidirectional battery state-of-charge monitor. Curtis Instruments, John F Ohlandt, April 26, 1988: US04740754 (26 worldwide citation)

The monitor is a circuit including an integrator for storing a state-of-charge measurement and a charge signal channel and a separate discharge signal channel both arranged for connection to receive a battery terminal voltage signal. The charge signal channel is operable in response to a battery ter ...


10
Eugene P Finger: Method and apparatus for measuring current, especially useful in multi-ampere systems. Curtis Instruments, Pennie & Edmonds, January 29, 1980: US04186339 (25 worldwide citation)

The disclosed method and apparatus make three connections to a pair of conductors: two at spaced-apart points on one conductor and the third on the other conductor. Using the power available in the conductors, a differential amplifier produces an output signal representative of current flow through ...