| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 1 | Time interval computer | US45143074 | 1974-03-15 | US3906479A | 1975-09-16 | FITCH TROY W |
| Precision test equipment requires periodic maintenance and calibration to insure accurate and reliable operation. For the most efficient use of such test equipment, it is serviced on the basis of time in operation and not on a calendar interval. To monitor the time in usage of test equipment and signal the expiration of an operating time interval, a computer is connected to the equipment and operated only when the test equipment itself is operational. This time interval computer utilizes as a timing element an electrochemical storage cell which has a pair of electrodes and contains active material for transfer between the pair of electrodes. The electrochemical storage cells control a four stage transistor switch that includes an output stage transistor controlling a warning light circuit. At the end of a selected time interval, as determined by a resistor in series with the storage cell, an oscillator takes over control of the output stage transistor to provide a flashing operation of the warning light.
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| 2 | Coulometrically timed indicator lamp circuits operable from high voltages | US548445 | 1975-02-10 | US3974495A | 1976-08-10 | John Paul Jones |
| A three terminal coulometric timer cell is provided having two terminals available to detect continuity of an anode filament that is ruptured after a predetermined time period by plating away upon a cathode cup-like container. Connected across said two terminals is a light emitting diode to visually indicate the end of the time period. Simplified circuit configurations requiring only the cell, two resistors and the light emitting diode are provided with variations permitting AC -- DC operation, reliable high voltage operation, low operating power and temperature stable operation. | ||||||
| 3 | Warning circuit for indicating that an intermittently operated device has been operated for a predetermined cumulative length of time | US523088 | 1974-11-12 | US3938128A | 1976-02-10 | Richard A. Pidsosny; John Zimmer |
| A warning circuit particularly suited for indicating that an intermittently operated device has been operated for a predetermined cumulative length of time. The circuit utilizes a coulometer as a current integrator that accumulates the intermittent periods of time during which the device operates. At the end of the predetermined cumulative length of time, the impedance of the coulometer changes from a low level to a relative higher level. This change in impedance renders a first transistor conductive and results in a warning indication. A second transistor is latched into a state of conductivity that causes a feedback current to flow through the coulometer to maintain it in its high impedance condition. The warning indication is controlled by an amplifier circuit which, in turn, is controlled by the second transistor. Once the high impedance of the coulometer is achieved, the second transistor at all times retains its state of conductivity indicative of this condition, but the amplifier circuit is operative only when the intermittently operated device is in operation. | ||||||
| 4 | Switched integrator | US32574973 | 1973-01-22 | US3863154A | 1975-01-28 | MARWELL EDWARD M; FINGER EUGENE P |
| A method and apparatus is disclosed for measuring the operational use of a physical system. The apparatus includes an integrator having a reversible coulometer, including a bored tube made of transparent or translucent material with a pair of electrodes connected to each side thereof. A transparent electrolyte is positioned in the bore between two columns of an opaque electrolytically platable metal. A pair of light sensitive elements, spaced from one another, are positioned on one side of the tube and a source of light is positioned on the opposite side of the tube. A source of current is intermittently connected to the electrodes of the coulometer such that current passes through the coulometer only when the system being measured is in use. A single logic input is provided which controls the direction of current flow through the coulometer and which energizes a warning device when a fault condition has occurred. After a predetermined quantity of charge has passed through the coulometer, the electrolytic gap will become positioned in a line between the source of light and one of the light sensitive elements. When this occurs, an output is generated which energizes a warning device which indicates that maintenance or servicing of the physical system is required.
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| 5 | Pulsed charged electrochemical timing cells and method of operating | US3755728D | 1972-03-22 | US3755728A | 1973-08-28 | HERZIG R; CLEMENT W; ZAULS J |
| A coulometer which is charged by a pulse charging method in an R-C network in series with the coulometer measures time by the passage of a known constant current through the cell so that when the current-time product has caused the transfer of a predetermined amount of active material in the coulometer an impedance transformation within the coulometer results in a voltage rise across the coulometer. The voltage rise applied across the input to a responsive means changes the potential at the input to change a negative output voltage of said responsive means to be changed to a positive output voltage. The output voltage change is substantially greater than the voltage rise in the coulometer. The output voltage change triggers a gate mechanism to actuate a suitable control.
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