Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 4523187 | Alarm system for electric fences A monitoring system for use with an electrified fence and an energizer (21) therefor, monitoring system being adapted to determine the effectiveness of electric pulses applied to the fence by the energizer (21) and including a voltage sensing device (10) ... | 06/11/1985 |
| 4523295 | Power loss compensation for programmable memory control system An arrangement for storing user programmed system timing information in a microprogrammable system in the event of a power outage. The system includes a static random access memory (RAM) for periodically storing microprocessor-generated timing information... | 06/11/1985 |
| 4520318 | Electric field strength indicator An electric field strength indicator for use with high voltage conductors comprises a capacitive probe mounted within a tubular shield having an insulating spacer at one end for locating the unit with respect to a conductor under test. The probe is electr... | 05/28/1985 |
| 4520418 | Reset circuit A reset circuit which monitors the voltage of the power supplied to a microprocessor unit, and produces a low resistance to ground at the reset terminal of the microprocessor whenever the supply voltage changes from a low value to a high value, or from a ... | 05/28/1985 |
| 4518062 | Procedure and measuring circuit for stopping an elevator A procedure for adjusting the stopping of an elevator as accurately as possible on desired level with the aid of the deceleration instruction (DR). From the elevator's deceleration instruction (DR) a sample is taken at the beginning and at the end of dece... | 05/21/1985 |
| 4514720 | Method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system A method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system such as a fire alarm system which cyclically samples a plurality of alarm units in the system for obtaining a series of measured values from ... | 04/30/1985 |
| 4503479 | Electronic circuit for vehicles, having a fail safe function for abnormality in supply voltage An electronic circuit for use in a vehicle equipped with an internal combustion engine. The electronic circuit comprises a constant-voltage regulated power-supply circuit, a control circuit having a central processing unit for controlling electrical appar... | 03/05/1985 |
| 4491968 | Status monitor A status monitor for coaxial cable networks is disclosed. The monitor is designed to be directly attached to an output port of an amplifier/repeater in the network and is used as an aid in trouble shooting faults in the network. The monitor comprises a de... | 01/01/1985 |
| 4488110 | Voltage monitor with visible level indicator There is provided a voltage monitor which monitors a first voltage. A means for providing a reference second voltage is provided. Also, a signal third voltage which is obtained from and is proportional to the first voltage is provided. A comparison amplif... | 12/11/1984 |
| 4470047 | Bidirectional, interactive fire detection system A communication system useful for fire detection which transfers data/commands bidirectionally between a controller and connected transponders on a real time, interactive basis. This system makes possible accurate data recovery, whether a transponder has ... | 09/04/1984 |
| 4459583 | Alarm system An alarm system which includes at least one primary detecting device that provides an analog output signal. The rate of change of the analog output signal is monitored, and an alarm signal is generated when the rate of change exceeds a preset limit. The a... | 07/10/1984 |
| 4428020 | Power supply sensing circuitry Power supply sensing circuitry comprises a first comparator for determining whether the power supply potential voltage exceeds by a predetermined amount the voltage required to operate a data processing system connected to the power supply potential, and ... | 01/24/1984 |
| 4423412 | Industrial process indicating/recording apparatus using stepping motor drive A compact ribbon-indicator and chart-recorder instrument for use in process control systems adapted to indicate and simultaneously record the values of up to three independent process variables. The motive power for each pen/indicator drive system is supp... | 12/27/1983 |
| 4410882 | System for monitoring the ignition function of rapid extinguishing systems In a fire sprinkler system a plurality of physically distributed actuators are connected in a normally balanced bridge circuit. The bridge circuit is impressed with a pulsed measuring voltage thereacross to conserve power. LEDs are connected to the bridge... | 10/18/1983 |
| 4403213 | Power supply diagnostic system A digital controller used in regulating the output of a power supply including a diagnostic circuit for sensing the failure of a component in the power supply. Upon the occurrence of a fault, signals are generated locating the component which caused the s... | 09/06/1983 |
| 4399428 | Thermostat A thermostat monitoring and controlling the temperature of produce ripening within an enclosure and featuring a bridge circuit sensing errors between the actual and desired temperatures in which the desired temperature is selected directly in units of deg... | 08/16/1983 |
| 4398188 | Ground circuit voltage detector A ground circuit voltage detector for monitoring stray ground voltages occurring in dairy equipment to provide both an instantaneous warning indication and a sustained alarm indication. The voltage detector is connected between the equipment to be monitor... | 08/09/1983 |
| 4366433 | Output voltage-drop detecting apparatus technical field An output voltage-drop detecting apparatus added to a stabilized DC power source device which includes a power control circuit for controlling a DC input voltage to produce a DC output voltage of a specified value, a reference voltage source whose voltage... | 12/28/1982 |
| 4366474 | Identification of electric power network phases experiencing disturbances A system for identifying which of the phases of an N-phase electric-power transmission network has experienced an electrical disturbance. For each phase there is produced a first signal representative of the transient variations of an electrical parameter... | 12/28/1982 |
| 4359679 | Switching d-c. regulator and load-sharing system for multiple regulators In a system of parallel switching regulators sharing a common load, each regulator generates controllable pulses from an unregulated d-c. voltage source and then smoothing those pulses to form a d-c. output that varies according to changes in the pulses. ... | 11/16/1982 |
| 4358755 | Signal selection circuit A signal selection system, including a plurality of detection circuits having inputs receiving respective direct voltage signals and outputs connected to a scan bus. Each detector circuit includes an operational amplifier having a non-inverting input rece... | 11/09/1982 |
| 4348655 | Control circuit for vehicle turn-signal flasher systems A control circuit for the turn-signal flasher system of an automotive vehicle. The flasher system includes a relay having switch contacts which are serially connected, together with a direction indicator switch, between the vehicle battery and the turn-si... | 09/07/1982 |
| 4336532 | Integrated nuclear radiation detector and monitor A battery powered device which can continuously monitor and detect nuclear radiation utilizing fully integrated circuitry and which is provided with an alarm which alerts persons when the radiation level exceeds a predetermined threshold.... | 06/22/1982 |
| 4335378 | Timed dual comparator alarm A combustion detection apparatus and method is provided for generating an alarm output when either a first alarm condition or a second alarm condition is present. A first alarm output is generated when a first predetermined concentration of combustion pro... | 06/15/1982 |
| 4334188 | Voltage detector using an oscillator and comparator means A wear-indicating brush and warning circuit adapted to convey an indication to an operator that a dynamoelectric machine provided with such a brush is in need of maintenance before the brush wears to the point that a rotor contact surface is damaged by co... | 06/08/1982 |
| 4333050 | Multiphase voltage monitor A monitor for a polyphase power line continuously compares the voltage on each phase of the power line with reference voltages that are selected percentages above and below the average of the power line voltages to detect voltage unbalance and with fixed ... | 06/01/1982 |
| 4330777 | Device for detecting imminent failure of high-dielectric stress capacitors A device for detecting imminent failure of a high-dielectric stress capacitor utilizing circuitry for detecting pulse width variations and pulse magnitude variations. Inexpensive microprocessor circuitry is utilized to make numerical calculations of digit... | 05/18/1982 |
| 4318092 | Means for checking battery voltage level Means for checking the voltage level of a battery used in an apparatus including an operational amplifier powered from the battery and an indicating means operatively connected to the output of the operational amplifier. The indicating means provides a re... | 03/02/1982 |
| 4316185 | Battery monitor circuit A battery monitor circuit for rechargeable multicell batteries that provides a reliable indication of battery failure independent of temperature, load and age, by continuously comparing the impedance of the cells of the battery against each other. Compari... | 02/16/1982 |
| 4311994 | Signal level indication with different colors A signal level indicator comprises first and second voltage comparators responsive to the low and high levels of an input signal, respectively. First and second switching transistors are provided. The base of the first transistor is connected to the outpu... | 01/19/1982 |
| 4307389 | Decoding circuit A circuit for sensing a plurality of inputs, each of which have a plurality of condition states, and providing a visibly coded output signal to a single indicator lamp, or the like, whereby one may readily determine the various condition states. The circu... | 12/22/1981 |
| 4296278 | Loudspeaker overload protection circuit The output of an audio power amplifier fed to a loudspeaker driver is sensed and when this output exceeds a predetermined level, a switch control circuit operates to place a current limiting device, such as a power resistor, in series with one of the driv... | 10/20/1981 |
| 4291356 | Apparatus for analyzing a physical quantity The disclosure herein describes an apparatus for analyzing a physical quantity, such as current, and for providing an indication of this quantity to an actuating element, for example a relay; a value of the physical quantity is compared to two preadjusted... | 09/22/1981 |
| 4283717 | Monitoring system for a direct-wire alarm system A direct-wire alarm system for scanning and monitoring a plurality of security alarm systems located in various user's facilities. The device monitors each line sequentially and converts current levels present on each line to a digital value. A digital fi... | 08/11/1981 |
| 4282517 | Automatic ringback for direct current monitoring system A ringback circuit in a security protection system, of the type which monitors a dc current, automatically reports to remote premises that the central station has, at an appropriate time, received an indication that the dc current has been changed to the ... | 08/04/1981 |
| 4280580 | Proximity detector system for a medical diagnostic device A mobile medical diagnostic device having a mobility chassis with two supporting wheels and a central steerable drive wheel. The device has an electrical power steering system controlled by two synchronized handles operable by wrist action of an operator ... | 07/28/1981 |
| 4278971 | Electric control circuit for safety apparatus in automotive vehicles An electric control circuit for a safety apparatus adapted to be actuated by electrically operated actuator, the control circuit including an electric power source, a first storage condenser connected with the power source through a resistor to be charged... | 07/14/1981 |
| 4277782 | Detection circuit and structure therefor A detection circuit particularly adapted as a smoke detector employes a minimum number of components by a CMOS integrated circuit which receives directly the output of a smoke detector on one of the inputs of an input comparator circuit which provides sta... | 07/07/1981 |
| 4263583 | Digital alarm system with variable alarm hysteresis A digital alarm system for monitoring a variable process signal utilizing a variable, digitally controlled alarm hysteresis capability. The system includes a means for establishing a preselected count level at which an alarm condition occurs. The preselec... | 04/21/1981 |
| 4255669 | Sensing apparatus Sensing apparatus for monitoring the operation of an electrical appliance. The sensing apparatus is plugged into a standard electrical outlet and the appliance to be monitored is plugged into the sensing apparatus. The appliance current flows through a tr... | 03/10/1981 |
