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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 6693548 | Structural monitoring system for helicopter rotor components A system for monitoring the structural condition of a helicopter rotor assembly component includes a piezoelectric sensor. Acoustic emission signal techniques allow for recognizing the relatively high frequency stress waves associated with the propagation... | 02/17/2004 |
| 6675071 | Power quality utility metering system having waveform capture A method of monitoring variations is carried out within an electrical energy meter containing means therein for metering a quantity of electrical energy generated by a supplier and transferred via a power supply line to a load. The method includes a first... | 01/06/2004 |
| 6670888 | Method of detecting improper mounting of acceleration sensors on a vehicle A method of detecting the improper mounting of a sensor on a motor vehicle includes monitoring the output signals of the sensor, determining the noise levels in the output signals, and comparing the noise levels from the output signals to a threshold nois... | 12/30/2003 |
| 6667692 | Electrical utility meter having harmonic data templates for power quality alarm thresholds An electrical utility meter having harmonic data templates advantageously enables a user to determine whether equipment at a particular site is susceptible to electrical damage or interference. According to an exemplary embodiment, the meter generates mea... | 12/23/2003 |
| 6658915 | Portable sensor A vapor sensing device that is sufficiently small and lightweight to be handheld, and also modular so as to allow the device to be conveniently adapted for use in sensing the presence and concentration of a wide variety of specified vapors. The device pro... | 12/09/2003 |
| 6646561 | Method and device for in-use detecting low cranking strength of a combustion engine battery during engine starting A method and device for in-use detecting low cranking strength of a combustion engine battery during engine starting, based on integrating changes in battery voltage specifically during engine starting, from the time the electro-mechanical starting load i... | 11/11/2003 |
| 6633171 | Electronic component desired voltage level comparison A comparison circuit for comparing the desired voltage levels of electronic components and for disabling the supply of power to those components if the desired voltage levels are not equivalent. The comparison circuit receives the desired voltage level in... | 10/14/2003 |
| 6614356 | Digital meter for use of current and voltage The present invention relates to a digital meter for use of the current and voltage, including a front end signal processing device, a press button input device, a central processing unit (CPU), an LCD controller, an LCD, and an alarm device. When the sig... | 09/02/2003 |
| 6600425 | Method and apparatus for detecting and recording episodic overloads in a circuit A apparatus for recording information on power surges in an electrical or electronic system is disclosed. The apparatus has a gas discharge tube connected between an input line of the electrical or electronic circuit protected and ground. The gas discharg... | 07/29/2003 |
| 6549138 | Method and apparatus for providing detection of excessive negative offset of a sensor Detection of excessive negative offset of a condition responsive sensor such as a pressure responsive full Wheatstone bridge element (10) and circuitry associated therewith is obtained by taking the sensor's output signal, preferably after the signal has ... | 04/15/2003 |
| 6541980 | Multiplex voltage measurement apparatus A multiplex voltage measurement apparatus configured to detect the breakage of a line coupling a voltage detection terminal and an electric leakage detection circuit includes a multiplex voltage measurement section and an electric leakage detection circui... | 04/01/2003 |
| 6522255 | Handle sensor for detecting signals from human body to a signal processing circuit In a signal processing circuit the detector of which is handle sensor, the tubular handle sensor thereof includes an insulating inner layer and a holdable conducting outer layer, the bottom and the right and left sides of the conducting outer layer are en... | 02/18/2003 |
| 6518880 | Physical-quantity detection sensor A physical-quantity detection sensor includes a sensor portion (10) for generating and outputting a voltage depending on a physical quantity. A signal processing circuit (4) operates for processing the voltage outputted from the sensor portion (10) to gen... | 02/11/2003 |
| 6459998 | Sensing downed power lines In systems embodying the invention, a "downed" power line is detected by sensing whether there is an open circuit along the power line and producing an indication that an open circuit condition exists. In response to an indication that an open circuit con... | 10/01/2002 |
| 6459377 | Abnormal condition detecting system detecting abnormal condition of user at residence From a parameter setting unit, a user enters values for monitor start time (STime), check time (ETime) and a telephone number for notification (TelNo). The entered parameter values are stored into a storage unit. A door opening/closing detection unit dete... | 10/01/2002 |
| 6456086 | Voltage monitoring device for monitoring two different supply voltages received by an electronic component A voltage monitoring device for monitoring two different supply voltages to be received by an electronic component. The monitoring device has a ratiometrically operating analog/digital converter, whose reference input is supplied with the larger supply vo... | 09/24/2002 |
| 6452502 | Method and apparatus for early detection of reliability degradation of electronic devices A circuit that senses changes in the electrical characteristics of one or more solder joints, and generates one or more signals based, at least in part, on the electrical characteristics that are sensed, is incorporated into an integrated circuit. In a fu... | 09/17/2002 |
| 6429785 | Revenue meter having precision time clock An electrical energy meter includes a voltage digitizing circuit, a current digitizing circuit, a metering circuit, a clock circuit, and a source of externally-generated time standard information. The voltage digitizing circuit is operable to obtain analo... | 08/06/2002 |
| 6414600 | Ground check system for delta-flex test handler There is provided a ground check system used with an input module and/or sort module of a test handler for checking automatically grounding wires associated with moving parts thereof. The ground check system includes a sensing circuit which is responsive ... | 07/02/2002 |
| 6384723 | Digital communication system and method A communication protocol facilitates transmission at maximum rates for various types of cables. Signal to noise characteristics are improved by using voltage waveforms. The protocol can be used to transmit information between a common control unit and a p... | 05/07/2002 |
| 6366209 | Method and apparatus for early detection of reliability degradation of electronic devices A circuit that senses changes in the electrical characteristics of a guard ring, and generates one or more signals based, at least in part, on the electrical characteristics that are sensed, is incorporated into an integrated circuit The one or more signa... | 04/02/2002 |
| 6360177 | Voltage scanning, measurement, storage and reporting device A portable unit, preferably adapted for plugging into a common wall outlet, has circuitry for monitoring the voltage and/or current provided through an electrical outlet. In addition to the monitoring circuitry, the unit preferably includes a microprocess... | 03/19/2002 |
| 6353914 | Preamp writer fault detection circuit A open circuit detection circuit for a hard disk drive write head, wherein the write head receives write drive signals from a write driver, and wherein the write driver generates a write drive signal in response to write control signals. The circuit inclu... | 03/05/2002 |
| 6337570 | Current loop comprising a test circuit The 4 mA-20 mA type or 0-20 mA type current loop connects an analog sensor (1) to an acquisition system (3), respectively carrying a sensor current (Ic) and an acquisition current (Ia). A test circuit is connected in parallel with the current loop to inje... | 01/08/2002 |
| 6329924 | Wearable electric field detector A wearable electric field detector has a housing mountable on a user's person and including a sensing circuit responsive to an electric field to generate a signal which varies in proportion to the strength of the sensed field, and an alarm circuit coupled... | 12/11/2001 |
| 6317056 | Circuit for intrinsically safe detection of the binary signals of a transmitter The intrinsically safe detection of binary signals of a sensor with a variable internal resistance is achieved by connecting the sensor to the voltage output of a d.c. voltage source via a shunt. To the voltage output is attached a multistage voltage divi... | 11/13/2001 |
| 6314307 | Portable electronic apparatus having a detection device for detecting a variation of the supply voltage The invention relates to an electronic apparatus whose power is supplied by a battery (11) having a memory (32) which contains electrically erasable data (32a) and a supply voltage detection device (37) for detecting a variation of the supply voltage (Vba... | 11/06/2001 |
| 6275161 | Method and apparatus for automotive battery condition indication The present invention concerns a system and an apparatus for monitoring the electrical condition of an automotive battery [2] in use. The main purpose of this invention is to monitor and indicate automotive battery conditions, namely liquid electrolyte le... | 08/14/2001 |
| 6259371 | Power surge detection device A power surge detection device is disclosed to investigate if there is any power surge occurring to a main processor in a computer system. When the width or frequency of power surges detected jeopardize the normal operation of the computer system, an aler... | 07/10/2001 |
| 6255939 | Method and device for sensing an object or a person in the interior of a vehicle A sensor for detecting an object or a person in the interior of a vehicle consumes a first average power in a normal operating mode. The power supply for supplying the sensor is monitored. The sensor is operated with a second average power which is reduce... | 07/03/2001 |
| 6246332 | System and method for detecting voltage and current imbalance in an electrical energy supply A system and method for detecting a current imbalance and a voltage imbalance in multiphase electrical energy provided to an energy meter. A phase single value is measured for each phase, a normalized phase value for each phase is determined, and a normal... | 06/12/2001 |
| 6243009 | Method and circuit arrangement for comparing output signals with reference signals having different reference levels A blinker-hazard flasher circuit has a single comparator (37) for comparing measured circuit output signals (36) containing information with reference signals having different voltage threshold levels to ascertain the information regarding the status of t... | 06/05/2001 |
| 6236326 | Method and apparatus for intelligently signaling a battery charge condition in a wireless telephone An apparatus and method for intelligent low battery response by a wireless telephone is provided. When the wireless telephone's rechargeable battery nears depletion of energy, and a call is in progress, the party conversing with the wireless telephone use... | 05/22/2001 |
| 6225911 | Information processing apparatus and its control method for cooling inside apparatus with fan An information processing apparatus includes a fan sensor for detecting a failure of a fan for cooling an inside of the apparatus and for outputting a cooling fan failure signal, a counter for starting time counting when the cooling fan failure signal is ... | 05/01/2001 |
| 6208242 | Circuit configuration to monitor a regulated output voltage in a motor vehicle The present invention relates to a circuit arrangement to monitor a regulated output voltage in an automotive vehicle, wherein the regulated output voltage is monitored as to whether defined threshold values have been exceeded and/or have fallen short of,... | 03/27/2001 |
| 6208258 | Circuit and method for determining whether AC mains voltage is below or above a predetermined set point A circuit for detecting whether or not an AC voltage mains is providing an AC voltage above a predetermined point including a full wave bridge and voltage divider, a voltage detection circuit including a pair of transistors and a zener diode, an optical c... | 03/27/2001 |
| 6169475 | System and method for active detection of connection to a network An apparatus and method for detecting a connection to a data transmission network functions by detecting the network signal energy on a network cable while avoiding the problems of excessive power consumption and generation of excessive electrical noise. ... | 01/02/2001 |
| 6163266 | Fan operation detection circuit for a DC fan and method of operation thereof For use with a DC fan, a detection circuit and a method of detecting an operational condition thereof. In one embodiment, the detection circuit includes: (1) a sensor, coupled to the DC fan, that senses a current through the sensorless DC fan and produces... | 12/19/2000 |
| 6157308 | Detecting hidden faults in reliable power systems A method and apparatus for detecting silent faults in feeding diodes of redundant DC power supplies. The voltages on both sides of the feeding diodes are measured. Arrangements are then made to ensure that if corresponding feeding diodes are both operativ... | 12/05/2000 |
| 6150945 | Static charge warning device A wearable device for alerting a user when a static electrical charge has developed on the user which exceeds a preset limit, prior to an accidental discharge of the static charge. The device includes a first conductive element in close proximity to the u... | 11/21/2000 |
