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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 7265555 | Loop impedance meter A loop impedance meter is provided for testing an AC electrical main supply incorporating a residual current device. The loop impedance meter includes an electrical control circuit for connecting a load resistance intermittently between the AC main supply terminal a... | 09/04/2007 |
| 7253737 | Automated antenna trim for transmitting and receiving semiconductor devices A radio frequency communication device and methods of testing and tuning an antenna attached thereto are disclosed. A radio frequency communication device comprises internal circuitry and an antenna having a plurality of antenna segments associated therewith. Each a... | 08/07/2007 |
| 7250776 | System for on-line assessment of the condition of a thermal coating on a turbine vane Aspects of the invention relate to a system for assessing the condition of a thermal barrier coating on a turbine vane during engine operation. According to embodiments of the invention, one or more wires can be passed along the airfoil portion of the vane. The wire... | 07/31/2007 |
| 7141990 | Device for detecting degradation of a component An apparatus for monitoring the structural integrity of a component. A monitoring structure is applied to a component that is subject to structural degradation. The monitoring structure includes an electrical conductor that becomes cracked if the component becomes s... | 11/28/2006 |
| 7064562 | Temperature compensation method for soot sensor Certain characteristics of Diesel engine lubrication oil are determined. A sensor formed as a capacitor is immersed in the oil. An inductor is in series with the sensor, and a high frequency voltage with a varying frequency is applied to the resonance circuit formed... | 06/20/2006 |
| 6867603 | Method for measuring high frequency resistance in diesel engine lubrication oil Soot content in Diesel engine lubrication oil is determined using electrical resistance measurements of the oil at high frequency. A sensor in the form of a capacitor is immersed in the oil, wherein the oil serves as a dielectric between the plates. The capacitance ... | 03/15/2005 |
| 6831450 | Electronic method and apparatus for measuring optical wavelength and locking to a set optical wavelength of Fabry-Perot tunable cavity opto-electronic devices Apparatus and methods are provided for measuring a selected optical behavior of a tunable opto-electric device by using the electrical characteristics of the opto-electronic device. The benefit of the present invention is the elimination or reduction in complexity o... | 12/14/2004 |
| 6806812 | Automated antenna trim for transmitting and receiving semiconductor devices A radio frequency communication device and methods of testing and tuning an antenna attached thereto are disclosed. A radio frequency communication device according to the present invention is disclosed comprising internal circuitry and an antenna having a plurality... | 10/19/2004 |
| 6690181 | Impedance measurements of bodily matter A method and apparatus for generating an impedance spectrum which is characteristic of a sample of bodily matter in a resonant circuit and which may be used to analyse the sample.... | 02/10/2004 |
| 6674291 | Method and apparatus for determining and/or improving high power reliability in thin film resonator devices, and a thin film resonator device resultant therefrom The effects of electromigration have been shown to lead to damage of metal electrodes of electronic devices such as thin film resonator (TFR) devices in only a few hours, for a test input power that is within the operational range of these devices. It has... | 01/06/2004 |
| 6501287 | Apparatus and method for measuring thickness Apparatus are provided for measuring coating thickness. The apparatus include first and second inductors, which may be coils, and measuring the impedance of conductors by passing alternating current through the conductors. The conductors are arranged so t... | 12/31/2002 |
| 6407557 | Process for measuring the electrical resistance of a resistive body for example for checking the conformity of a liquid product and devices for carrying out such a process Measuring the electrical resistance of a resistive body, in particular a reservoir containing a printing product such as ink. According to the invention, the resistive body is used to define a capacitance arrangement formed from a capacitive branch which ... | 06/18/2002 |
| 6401046 | Modulated interface for remote signals A circuit 17 for interfacing with a sensor 18 having a sensor input current and a modulated sensor current signal corresponding to a sensed condition. A control module 20 is coupled to the sensor 18 and receives the sensor current signal. The control modu... | 06/04/2002 |
| 5642053 | Fluid identification sensor A sensor can detect the difference in potential between itself and the fluid into which it is immersed, a signal generated by the probe representing this difference in potential. This signal is used to activate an oscillator circuit. By varying the condit... | 06/24/1997 |
| 5528142 | Resonant eddy analysis- a contactless, inductive method for deriving quantitative information about the conductivity and permeability of a test sample A method for quantifying the permeability or conductivity of a conducting material, comprises the steps of providing a circuit including an inductor with a coil and a capacitor connected in parallel to the inductor, the coil having an interior space adapt... | 06/18/1996 |
| 5506497 | Process and device for microwave surface resistance determination A process for determining a surface resistance to microwave energy of a superconductive film provides a metallic cavity resonator whose resonator cavity is defined by metallic walls, and positioning a superconductive film whose microwave surface resistanc... | 04/09/1996 |
| 5412318 | Device for detecting attempts at fraud on an apparatus for reading and writing on a chip card A device for detecting attempts at fraud by connection of an electric feed line (13) to an apparatus for reading and writing on a chip card (3) essentially comprises a resonance unit (6) coupled to a contacting element (2) of the apparatus, and a measurin... | 05/02/1995 |
| 5278512 | Apparatus and method for continuously monitoring grounding conductor resistance in power distribution systems A method and apparatus is disclosed for continuously monitoring the resistance of a grounding conductor to neutral conductor circuit of a power distribution system. The apparatus compares a parameter of a damped sinusoidal waveform from a shock excited re... | 01/11/1994 |
| 5105158 | Dielectric microwave resonator probe A dielectric resonator probe for measuring surface resistance of a test material, particularly at cryogenic temperature, is provided. A dielectric resonator is mounted near to but spaced from a conductive plate and is positioned in contact with a test mat... | 04/14/1992 |
| 4973912 | Method for contactless measurement of a resistance arranged in the secondary circuit of a transformer and device for carrying out the method A method and a device for transmitting and for measuring resistance values, is particularly provided for use in motor vehicles, for the constant control of airbag systems. In the method and device an exciter signal coupled into a secondary-side resonant L... | 11/27/1990 |
| 4968945 | Open tube resonator test setup for conductivity measurements An apparatus and method for measurement of ohmic loss and surface resistivity is provided with a straight lumen waveguide with at least one opening at one end. Diffraction of radiation introduced to the lumen at one end of the tube provides feedback to es... | 11/06/1990 |
| 4958131 | Circuit arrangement for the combined application of an inductive and capacitative device for the non-destructive measurement of the ohmic resistance of thin layers The invention concerns a circuit arrangement for the combined application of an inductive and capacitative device (2, 3) for the non-destructive measurement of the ohmic resistance of thin layers. Such thin layers are, for instance, produced in high vacuu... | 09/18/1990 |
| 4810950 | Load resistance measuring technique The resistance of an inductive load is measured by connecting an inductor to the load and applying a pulse of energy to the load and the inductor. The voltage across the inductor is monitored and the load voltage and current are measured when the inductor... | 03/07/1989 |
| 4808911 | Loop resistance test apparatus An apparatus for measuring the resistance in a closed loop electrical circuit without breaking or otherwise disturbing the circuit includes a detachable connector for joining the measuring apparatus to a closed circuit. The connector is linked to a circui... | 02/28/1989 |
| 4797614 | Apparatus and method for measuring conductance including a temperature controlled resonant tank circuit with shielding A meter for sheet conductance measurements does not touch the conductive surface of a sample. A probe having a resonant tank coil is positioned against a parallel supporting surface of the sample, which may be flat or curved and of unrestricted area. An o... | 01/10/1989 |
| 4603980 | Methods of measuring temperature and electrical resistivity in a molten glass stream A small sensor electrode with only the tip exposed is used with a much larger return electrode to complete a high frequency circuit through molten glass. The sensor electrode is calibrated in the laboratory and then used to measure the resistivity of the ... | 08/05/1986 |
| 4415859 | Paraffin monitor A paraffin monitor includes a pair of probes which are immersed in a medium having paraffin contained therein. A circuit is connected to the probes which provides an output voltage. The characteristics of the electric circuit changes over a period of time... | 11/15/1983 |
| 4353027 | Contactless resistivity measurement method and apparatus Methods and apparatus for contactless, non-destructive resistivity measurnts on semiconducting crystalline material, for example gallium arsenide. The material to be tested is formed into a disc which is supported within an air gap. The holder for the di... | 10/05/1982 |
| 4224483 | Electronic loaded/nonloaded telephone loop identification circuit An electronic loop identification circuit identifies loaded and nonloaded customer telephone loops. The loops can then be segregated to allow separate balance networks to be used for hybrid circuits which connect the customer loops to a digital switching ... | 09/23/1980 |
| 4075557 | Contactless facilities for determining the specific resistance of a test sample A rapid and accurate technique for generating indications representative of the specific resistance of a test sample, such as a silicon disc, is described. A capacitive probe is electrostatically coupled to the sample, and the input terminals of the probe... | 02/21/1978 |
| 4001675 | Test set for measuring impedance and power dissipation of a crystal A crystal test set comprising an oscillator circuit in which a crystal under test is an integral part. The resistor substitution technique is employed in which the crystal and a variable resistor are alternately connected into the oscillator circuit. With... | 01/04/1977 |
| 3967191 | Method and apparatus for non-destructively measuring internal film resistance in a fluorescent lamp The resistance of a conductive film coating on the interior bulb wall of a fluorescent lamp is measured by capacitive coupling from the exterior bulb wall. A pair of metal bands engage the exterior bulb wall, with one band being connected to ground throug... | 06/29/1976 |
