Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5767781 | Method for detection of failed heater in a daisy chain connection Currents input to and output from a device, such as a heater, in a daisy chain connection are measured and compared. Failure of an individual device, as well as device location, is indicated if no current is consumed by the device. A latch is activated in... | 06/16/1998 |
| 5757275 | Fault monitoring technique for programmable logic controllers An isolated fault monitoring circuit for a AC port in an AC I/O module for a programmable logic controller is taught. Briefly stated, a bridge circuit is series connected to a fuse and an optocoupler. When the fuse which is in series with the AC input lin... | 05/26/1998 |
| 5751217 | Method and apparatus for assessing available battery life in a rechargeable battery Available battery life of a rechargeable battery is assessed and indicated to a user (300). A temporary load is switched onto a fully charged battery (304, 308) and voltage measurements are taken in both unloaded and loaded conditions (306, 310). The batt... | 05/12/1998 |
| 5717384 | Warning device for printers A modular peripheral error warning device for use with printers having a CENTRONICS parallel port. The peripheral error warning device monitors various voltages of connecting wires that interface with the computer and the printer and includes an interface... | 02/10/1998 |
| 5708420 | Voltage detection circuit compensated in technology and temperature A voltage detection circuit includes a first resistive arm receiving an internal voltage to produce a basic current, current amplification circuitry to produce a reference current proportional to the basic current, a second resistive arm to produce a refe... | 01/13/1998 |
| 5703790 | Series connection of multiple digital devices to a single power source A digital processing system including a first processor (11) and a second processor (21) connected in series between a first power supply node (101) and a second power supply node (103). The second processor is configured to operate at a variable processi... | 12/30/1997 |
| 5696437 | Intelligent low battery detection circuit for a paging receiver A low battery condition is determined by sampling battery terminal voltage with a voltage comparator under light and heavy loading, and indicating a low battery condition when the rate of change of the sampled voltage or the rate of change of the internal... | 12/09/1997 |
| 5684465 | Method and means for supervision of valve units The invention relates to a method for supervising the functioning of a plurality of valve units, a system for performing the method, a control unit and a control assembly for cooperation with the control unit. Each valve unit in the system comprises a sem... | 11/04/1997 |
| 5684466 | Electrical strike system control for subsurface boring equipment An electrical strike sensing system for providing an alarm if the underground boring equipment encounters a potentially hazardous condition. The system senses current carried through the equipment, as well as the voltage between the equipment and a refere... | 11/04/1997 |
| 5663713 | Control system A control system comprises a controller for controlling an actuator, for instance of an electrically power assisted vehicle steering system. An unstable circuit, such as first and second cascade connected integrators has an input connected to the controll... | 09/02/1997 |
| 5656991 | Apparatus for testing an actuatable restraint system An apparatus for testing the operativeness of a squib in an active restraint system wherein the squib has a resistance value, when operative, within a predetermined range of resistance values. The squib is connected in series with a firing circuit to a fi... | 08/12/1997 |
| 5650907 | Circuit breaker An electronic circuit breaker is provided with a plurality of air coils, each of which is coupled to a main circuit and an overcurrent signal integrating circuit which receives the output of the air coil to output an overcurrent signal when the current th... | 07/22/1997 |
| 5648759 | Failsafe voltage regulator with warning signal driver A voltage regulator, a device driver, and a warning signal driver are provided on a single voltage regulator integrated circuit. The voltage regulator provides a regulated voltage for external logic such as a microcontroller. The device driver selectively... | 07/15/1997 |
| 5637998 | Digital system for detecting angular position The present invention relates to a digital angle detection system, or more particularly, to provide a digital angle output that is stable and the least affected by a cable length or the like. A digital angle detection system of the present invention uses ... | 06/10/1997 |
| 5627759 | Electrical energy meters having real-time power quality measurement and reporting capability A revenue accuracy meter and a method are provided for measuring the amount and quality of power received by a power customer across electrical power lines. The revenue accuracy meter preferably has a variation determiner for determining undesired variati... | 05/06/1997 |
| 5623249 | Video monitor motion sensor Motion is detected from a surveillance monitor by means of a photosensor attached to the monitor screen and an electric circuit connected to the sensor which generates an alarm signal in response to changes in the level of an electric output signal genera... | 04/22/1997 |
| 5583731 | Input or output device, for programmable automatic controllers to detect an electrical fault of the channels A device is adapted to be associated with a group of input or output channels, especially of a programmable automatic controller, to detect if the channels are subject to an open circuit and/or an overcurrent. To each channel are assigned two analog compa... | 12/10/1996 |
| 5578987 | Monitoring apparatus for an alarm device A monitoring apparatus for an alarm device for situations wherein the alarm device is provided at a location remote from the alarm device drive side, which can verify from the alarm device drive side if an audible alarm has sounded. The drive of the alarm... | 11/26/1996 |
| 5565851 | Fluid level sensing systems A fluid level sensing system, particularly for sensing the water level in a steam generating boiler, comprises a vessel connected to the boiler so as to contain water and steam at substantially the same level as in the boiler, a number of vertically space... | 10/15/1996 |
| 5561605 | Arc detection using current variation In an electric circuit supplying AC line current to a load (30, 31) from an AC source (26) of given frequency providing repetitive cycles, arc detection is provided by sensing cycle to cycle changes in the AC line current. The AC line current is sampled w... | 10/01/1996 |
| 5561764 | Computer able to determine whether or not a display is connected to it, in accordance with the status data stored in a register and method of detecting whether or not a display is connected to a computer A computer comprising a main body, a connector having pins for connecting an external display to the main body, a register for storing data representing a first status or a second status in accordance with the voltage of specified ones of the pins of said... | 10/01/1996 |
| 5555483 | Automatic power line monitor system An automatic power line monitor system is disclosed for use in monitoring the electrical voltage supplied to an electrical system or appliance by monitoring the supplied electrical voltage and preventing the supplied electrical voltage from reaching the e... | 09/10/1996 |
| 5537024 | Circuit arrangement to detect a voltage In a circuit arrangement to detect a voltage (U), the voltage is applied to the input of a voltage detector (VD) through a voltage divider (R1, R4), the voltage detector (VD) comprising a Schmitt-Trigger with reference voltage and an output driver. The ou... | 07/16/1996 |
| 5534854 | Fan failure alert for electronic equipment A detection and alarm circuit for protection of electronic components includes a fan motor current sensing resistor for producing a pulse that is amplified and introduced to a frequency-to-voltage converter for generating a filtered and processed voltage ... | 07/09/1996 |
| 5512837 | Voltage drop detecting circuit In a voltage drop detecting circuit, when voltage Vcc being monitored is at a steady-state value, reference voltage B is classified by divided voltages Va to Vc from detection voltage generation circuit group for classification of reference voltage. In ac... | 04/30/1996 |
| 5457450 | LED traffic signal light with automatic low-line voltage compensating circuit The present invention relates to an LED traffic signal light containing numerous LEDs and a voltage compensation circuit which allows the traffic light to operate over a wide range of input power voltages, while generating sufficient light intensity to co... | 10/10/1995 |
| 5452223 | Arc detection using current variation In an electric circuit supplying AC line current rent to a load (30, 31) from an AC source (26) of given frequency providing repetitive cycles, arc detection is provided by sensing cycle to cycle changes in the AC line current. The AC line current is samp... | 09/19/1995 |
| 5444431 | Intrusion monitoring device A voltage level detector circuit comprises an amplifier for amplifying the electrical output signal from a detection device, a pair of comparators for comparing the amplified electrical output signal with a respective threshold signal, wherein each compar... | 08/22/1995 |
| 5422630 | Continuous monitoring electrostatic discharge system A monitoring system is shown to include a connector, having an input path and a current return path, for connecting a two section wrist strap to said connector, said two section wrist strap, when affixed to an operator's wrist, would complete an electrica... | 06/06/1995 |
| 5420511 | System for continuous monitoring of the electrical conduction of an AC power system A system for continuously monitoring electrical conduction of an AC power system comprises at least one measuring module connected between two conductors of the power system. A measuring cycle is divided into two periods. During the first period, the modu... | 05/30/1995 |
| 5416470 | Contact judging circuit and contact judging method for impedance measuring apparatus The contact between a device under test (DUT) and a measuring terminal is accurately judged with a simple circuit for impedance measurement. The conduction detecting means injects a judging current into the voltage terminal (LP) for low voltage... | 05/16/1995 |
| 5402119 | Multiple-input aircraft annunciator system Aircraft systems and sensors are monitored by pre-wiring a plurality of mating connectors to each system. Each mating connector has a positive voltage pin, a zero voltage pin and a reference pin. For those systems and sensors that emit zero voltage, the s... | 03/28/1995 |
| 5394035 | Rate of change comparator A rate of change comparator uses an RC charging circuit and a separate RC discharging circuit to follow a transducer output. The resistor component of each RC circuit is shunted by a diode, each biased in a different orientation so that the charging circu... | 02/28/1995 |
| 5331314 | Circuit for monitoring of loads A circuit is described for monitoring of loads having measuring resistors in the load circuit. The circuit evaluates the measuring voltage drops obtained at the measuring resistors. The circuit comprises at least one comparator stage made up of a referenc... | 07/19/1994 |
| 5315256 | Fault detection circuit for use in determining the existence of a fault in any one of a plurality of DC loads A fault detection circuit for a plurality of DC loads uses a reference load as a benchmark. The voltages at the centerpoints of the loads to be monitored are monitored and compared with the voltage of the centerpoint of the reference load. The comparison ... | 05/24/1994 |
| 5313165 | Temperature-compensated apparatus for monitoring current having controlled sensitivity to supply voltage An apparatus for monitoring current through a lamp circuit that uses a series resistance shunt in the circuit with one end connected to a current source and the second end connected to the lamp. The apparatus includes a comparator that is connected across... | 05/17/1994 |
| 5307049 | Alarm control method A drive current for driving actuators is generated based on a first digital signal comprising n-bit binary data which is supplied from a microprocessor and it is applied to an excitation coil. The drive current is supplied to the exciting coil and is conv... | 04/26/1994 |
| 5302944 | Method and apparatus for the monitoring of the operation of linear and rotary encoders A system is provided for monitoring signals from a linear or rotary encoder or scale to provide a warning of a malfunction of the encoder or to be able to predict a future malfunction. The system includes a feedback circuit for comparing the output of the... | 04/12/1994 |
| 5300924 | Harmonic measuring instrument for AC power systems with a time-based threshold means An instrument for measuring voltage harmonics and current harmonics on AC (alternating current) power systems. The instrument includes the ability to determine when threshold limits have been exceeded for harmonics. The instrument also includes timing thr... | 04/05/1994 |
| 5296844 | Electrical contact avoidance device An electrical contact avoidance device comprises an inductor plate directly or capacitively coupled to the user and coupled to a detector circuit which derives a DC signal corresponding to a voltage induced in the user's body by a radiated high voltage el... | 03/22/1994 |
