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Evgenij Barsoukov, Dan R Poole, David L Freeman: Circuit and method for measurement of battery capacity fade. Texas Instruments Incorporated, W Daniel Swayze Jr, W James Brady, Frederick J Telecky Jr, May 10, 2005: US06892148 (78 worldwide citation)

The remaining run-time (t_rem) of a battery is determined independently of the condition of the battery and the amount of load on the battery by obtaining the value of a present total zero-current capacity (Qmax) of the battery based on relaxed-battery OCV values measured just before and just after ...


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John E Landau, Wallace E Matthews, David L Freeman: Method and apparatus for monitoring battery capacity. Benchmarq Microelectronics, Ross Howison Clapp & Korn, February 8, 1994: US05284719 (58 worldwide citation)

A battery detect circuit (32) is connected to the battery with the current input to the battery and extracted from the battery measured with a sense resistor (50) and then converted to charge and discharge pulses with a V/F converter (52). A microcontroller (64) is operable to increment a Nominal Av ...


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Gene L Armstrong II, William F Davies Jr, David L Freeman: System for charging/monitoring batteries for a microprocessor based system. Benchmarq Microelectronics, Gregory M Howison, July 11, 1995: US05432429 (45 worldwide citation)

A battery monitoring/control device includes a monitor/control device (35) that is operable to be integrated with a microprocessor system. The system includes a CPU (12) that interfaces with a data bus (14) and an address bus (16). The CPU (12) interfaces through a data line (40) with the control/mo ...


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John E Landau, Wallace E Matthews, David L Freeman: Method and apparatus for monitoring batttery capacity with charge control. Benchmarg Microelectronics, Gregory M Howison, August 8, 1995: US05440221 (41 worldwide citation)

A battery detect circuit (32) is connected to the battery with the current input to the battery and extracted from the battery measured with a sense resistor (50) and then converted to charge and discharge pulses with a V/F converter (52). A microcontroller (64) is operable to increment a Nominal Av ...


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David L Freeman, Darrell C Bush: Method and apparatus for nonsteady state testing of permeability. Core Laboratories, Lee C Robinson Jr, December 3, 1985: US04555934 (35 worldwide citation)

The permeability of a core sample is measured during nonsteady state flow of fluid therethrough. A predetermined test pressure is supplied to an upstream end of the core sample while that sample is disposed in a fixed, closed volume and is subjected to a constant, predetermined confining pressure. T ...


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John E Landau, Wallace E Matthews, David L Freeman: Battery monitoring circuit for operating with high battery discharge rates. Benchmarq Microelectronics, Ross Howison Clapp & Korn, October 18, 1994: US05357203 (32 worldwide citation)

A battery detect circuit (32) is connected to the battery with the current input to the battery and extracted from the battery measured with a sense resistor (50) and then converted to charge and discharge pulses with a V/F converter (52). A microcontroller (64) is operable to increment a Nominal Av ...


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David L Freeman, Mark G Rockley, Donald G Harville: Method for quantitative analysis of core samples. Western Atlas International, Robert E Lowe, E Eugene Thigpen, Barry C Kane, June 13, 1989: US04839516 (29 worldwide citation)

A method for quantitative mineral analysis of core samples obtained from oil and gas wells is disclosed. The method includes the steps of grinding the sample to very small particle size and combining the sample with a carrier material such as KBr to form a pellet. The pellet is observed in a Fourier ...


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John E Landau, Wallace E Matthews, David L Freeman: Display system for a battery monitoring circuit. Benchmarg Microelectronics, Gregory M Howison, October 3, 1995: US05454710 (17 worldwide citation)

A battery detect circuit (32) is connected to a battery, with the current A battery V:the battery and the current extracted from the battery measured with a sense resistor (50) and convened to charge and discharge voltages with a V/F converter (52). A microcontroller (64) is operable to increment a ...