Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8143899 | Method and apparatus for detecting partial discharges in electrical systems A method of detecting partial discharge associated with at least a portion of an electrical system, wherein the electrical system includes at least one electrical machine electrically coupled within the electrical system, includes generating an electromagnetic field... | 03/27/2012 |
| 8022711 | Wire fault locating in distributed power systems An electrical fault locating system for distributing power from an input to a plurality of output channels provides fault detection and locating for each of the plurality of output channels. Each of the plurality of output channels is monitored by a fault detection ... | 09/20/2011 |
| 8013613 | Voltage indicator test mechanism An electrical safety monitor includes line inputs for an L1, an L2, an L3, and a GND three-phase connections, a line monitoring circuit having a plurality of light indicators and configured to produce light if voltage exists between any two of t... | 09/06/2011 |
| 7982466 | Inspection method for semiconductor memory A method for inspecting a semiconductor memory having nonvolatile memory cells using ferroelectric capacitors is disclosed which comprises, after shelf-aging the ferroelectric capacitor in a first polarized state, the steps of: (a) writing a second polarized state o... | 07/19/2011 |
| 7847560 | Method to detect and locate a breach in vertical or horizontal intersections in a membrane of a roof A defect in a horizontal or vertical seam at the edge of a roof membrane is detected by applying a DC voltage between the roof deck a probe in the form of a flexible wetted sponge and wiping the sponge probe over the seams. The current to the probe is detected and i... | 12/07/2010 |
| 7652481 | Method and apparatus to detect and locate roof leaks A leak in a membrane on top of a horizontal roof deck is located by applying conductive wires on the membrane underneath the aggregate in a grid pattern. A measuring and switching circuit generates voltage having a positive attached to the roof deck and a negative a... | 01/26/2010 |
| 7642789 | Storage device, and writing unit diagnosing method The present invention provides a storage device and a writing unit diagnosing method, which can determine a defect in a writing unit at an early stage. There is provided a storage device, which includes writing units that write data to a storage medium, current appl... | 01/05/2010 |
| 7521937 | Measurement circuit and test apparatus There is provided a measurement circuit including a main amplifier that generates a direct voltage in accordance with an input voltage and applies the generated voltage to a device under test, a feedback element that feeds back the direct voltage to the main amplifi... | 04/21/2009 |
| 7482815 | Method of operating a shielded connection, and communication network To provide a method of operating a shielded connection where signals are exchanged between two nodes (1) on a communications network over a connecting line (5a, 5b) and the connecting line (5a, 5b) has a... | 01/27/2009 |
| 7443171 | Devices and methods for detecting current leakage between deep trench capacitors in DRAM devices A test device for detecting current leakage between deep trench capacitors in DRAM devices. The test device is disposed in a scribe line region of a wafer. In the test device, a first trench capacitor pair has a first deep trench capacitor and a second deep trench c... | 10/28/2008 |
| 7391335 | Aerospace light-emitting diode (LED)-based lights life and operation monitor compensator A system (10) and method for monitoring the operational life and/or performance of one or more light-emitting diodes (LEDs) (20) based on sensed parameters are disclosed. The remaining life of each LED may be predicted by counting the clock cycles duri... | 06/24/2008 |
| 7358750 | Inspection apparatus for printed board An inspection apparatus comprises a fixed unit including a control device and a measurement device, and a moving unit including contact terminals, which are brought into contact with contacts formed on a printed board having electrode patterns subjected to electrica... | 04/15/2008 |
| 7358753 | Probing apparatus, probing circuit board and probing system for high-voltage matrix probing A probing apparatus, probing circuit board and probing system for high-voltage matrix probing are provided. Switching circuits of the probing apparatus capable of probing a plurality of probing points for high-voltage matrix probing are manufactured with using a mix... | 04/15/2008 |
| 7352166 | Resistance ratio digitizing ohmmeter system A digitizing ohmmeter system for providing a digital resistance ratio measurement includes a high impedance current source providing a DC excitation current to an impedance-varying input sensor and a reference resistor and an ADC circuit including a charge-balancing... | 04/01/2008 |
| 7345366 | Apparatus and method for testing component built in circuit board A multi-layered circuit board a built-in component including multiple terminals, at least one signal pad formed on a top surface of the multi-layered circuit board for signal transmission, each of the at least one signal pad corresponding to one of the multiple term... | 03/18/2008 |
| 7342400 | Method and apparatus for measuring employing main and remote units A test instrument employs main and remote test units at respective ends of a cable under test. The units operate in an active or passive measurement mode, wherein one of the units begins as the active unit, applying test signals to the cable under test to make a set... | 03/11/2008 |
| 7327199 | Phase-locked loop (PLL) device and method for entering a test mode without a dedicated test pin According to one embodiment, a phase-locked loop (PLL) device includes test circuitry for entering/exiting a test mode upon receiving a particular pulse train at a reference clock input of the PLL. In addition, exemplary methods are provided herein for entering a te... | 02/05/2008 |
| 7323880 | Ground circuit impedance measurement Novel apparatus and method accurately measure ground circuit impedance. A ground circuit and electrical current source adjusted to 25 amperes or less simulate a ground fault. Ground impedance is determined by dividing voltage drop by amperage to determine impedance ... | 01/29/2008 |
| 7317391 | Safety alert device A danger warning system includes a central station and modules connected via at least one series connection. A mechanism in the central stations determines the distance between the central station and the modules. The modules are triggered by the central station, su... | 01/08/2008 |
| 7315974 | Method for detecting faults in electronic devices, based on quiescent current measurements The present invention is related to a method for testing a micro-electronic device, by applying a plurality of test vectors to said device, and measuring for each test vector, the quiescent supply current IDDQ, to said device, wherein each IDDQ | 01/01/2008 |
| 7313498 | Device and method for testing an electrical circuit A method and device for testing an electrical circuit, which do not require a thorough electrical circuit simulation but reliably identifying circuit faults. Preferred embodiments generate a fault signal that indicates that a given state of the circuit, which is def... | 12/25/2007 |
| 7310315 | Node judging method, communication system, and node measuring apparatus In a communication system wherein a station transceiver and a plurality of nodes communicate in a TDM system through a signal transmission line, at least a part of the line is shared, a method to judge nodes performing normal operation from the station transceiver c... | 12/18/2007 |
| 7274194 | Apparatuses and methods for repairing defects in a circuit Methods and apparatuses to repair defects in a circuit, such as during or subsequent to the manufacture of the circuit. Defects may be detected through, for example, optical processing of an acquired image of the circuit or by measuring the strength of a signal emit... | 09/25/2007 |
| 7265633 | Open loop bandwidth test architecture and method for phase locked loop (PLL) A phase locked loop (PLL) can include a test loop filter (100) that generates a control voltage (VCTRL) for input to a voltage controlled oscillator (VCO). In a test mode, a control voltage can be varied and resulting output frequencies recorded, f... | 09/04/2007 |
| 7253629 | Circuit protection device with grounded neutral half cycle self test The present invention is directed to a circuit and method for self-testing a protection device for use in an AC power distribution system. The device is configured to be coupled between an AC power distribution system and at least one load. The method includes the s... | 08/07/2007 |
| 7253640 | Arc fault detector and method for locating an arc fault A circuit breaker for locating an arc fault for a protected circuit includes separable contacts interrupting the protected circuit and an arc fault detector determining an arc fault in the protected circuit. An analog to digital converter circuit measures a value of... | 08/07/2007 |
| 7251284 | QAM receiver A QAM receiver is disclosed. According to one aspect, a QAM receiver includes a signal input for receiving an analog input signal. Further, the QAM receiver includes an anti-aliasing filter and a series connected analog/digital converter for converting the received ... | 07/31/2007 |
| 7250872 | Method and device for testing at least one LED strip A test device for at least one LED strip contains: a voltage source, by way of which a cold test voltage or a warm test voltage can be applied to a parallel circuit formed of a test resistor and the LED strip, and an evaluation unit which records the cold test curre... | 07/31/2007 |
| 7242917 | Apparatus and method for antenna attachment An apparatus and method of for attaching an antenna to a mobile communication device. The apparatus can include radio frequency generation circuitry, a radio frequency feed point coupled to the radio frequency generation circuitry, a direct current voltage source co... | 07/10/2007 |
| 7239126 | System bench wireless mapping board A system for testing electronic modules comprising at least one mapping board box, and at least one harness operably attached to the mapping board box with a harness port is disclosed. The mapping board box comprises pin receptors, wherein the receptors are in commu... | 07/03/2007 |
| 7236761 | Balanced circuit arrangement and method for linearizing such an arrangement The present invention relates to a balanced circuit arrangement and methods for linearizing and calibrating such a circuit arrangement, wherein linearization is obtained by introducing a load imbalance between the output branches of the balanced circuit arrangement.... | 06/26/2007 |
| 7233152 | Short detection circuit and short detection method A circuit and method for judging a latent short-circuit defect, also known as a short-circuit defect with time passing, in the case of a high voltage system. A detection-dedicated wiring for detecting a short-circuit defect is provided between a first high voltage s... | 06/19/2007 |
| 7230412 | Distinguishing network interface card from short circuit condition in power over ethernet system Novel system and methodology for distinguishing a Network Interface Card (NIC) from a short circuit condition in a Power over Ethernet (PoE) system. A system for providing power to a powered device (PD) includes a PD probing circuit that generates a detection signal... | 06/12/2007 |
| 7224170 | Fault monitoring in a distributed antenna system A method and system for detecting whether an antenna is property connected to a distributed antenna network. The current drawn by the antenna is measured and compared against an expected current draw or reference level. The measured level of current drawn by the ant... | 05/29/2007 |
| 7224160 | RF and pulse bias tee A RF and pulse bias tee for use with a source measure unit (SMU) includes a SMU source terminal; a SMU measure terminal; an output terminal; a SMU measure terminal pulse/RF block between the SMU measure terminal and the output terminal; a SMU source terminal high fr... | 05/29/2007 |
| 7218120 | Fault detection circuit for a driver circuit Various component parts of a driver circuit for drive sources such as electric motors and clutches, such as relays and FETs as well as the drive sources can be tested by selectively energizing the relays and evaluating the voltage levels of the selected points by us... | 05/15/2007 |
| 7216315 | Error portion detecting method and layout method for semiconductor integrated circuit For the purpose of readily specifying a portion of the circuit which has a high possibility of error occurring due to a variation in the supply voltage so that the specified vulnerable portion is countermeasured in a mask layout process, a simulation section simulat... | 05/08/2007 |
| 7185545 | Instrumentation and method for monitoring change in electric potential to detect crack growth Instrumentation for monitoring crack growth using a change in electric potential across a starter crack as the crack propagates is disclosed. The instrumentation includes a specimen of a material to be analyzed for crack growth propagation having a surface with a st... | 03/06/2007 |
| 7161356 | Voltage/current testing equipment for microfluidic devices The present invention provides novel methods and devices for testing/verifying the configuration of one or more microfluidic elements in a microfluidic device. In particular the methods and devices of the invention are useful in testing for blockages or the presence... | 01/09/2007 |
| 7157896 | Device for locating and identifying circuit breakers The transmitter of the circuit breaker locator draws large amplitude, short duration, phase locked unipolar pulses of current from the power source at a frequency lower than that of the AC line frequency. The audible and visual indicators of the transmitter are trig... | 01/02/2007 |
