Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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 |
| 8102181 | Method and device for rapid non-destructive quality control of powdered materials Method and related device intended for rapid non-destructive testing of powdered materials with low electric conductivity such as cement and cement-based compositions through determination of their electrical properties. The invention involves an electromagnetic met... | 01/24/2012 |
| 7701228 | Switchable manual/motor-driven NMR tuning systems and methods According to some embodiments, motor-tuned nuclear magnetic resonance (NMR) probes may be tuned manually without overcoming the tuning motor holding force. An NMR probe includes a switchable manual-mode/motor-driven mode capacitance-adjustment assembly for adjusting... | 04/20/2010 |
| 7554341 | Method and measurement apparatus for determining the transition impedance between two parts of a subdivided neutral electrode A method and a measurement apparatus are provided for determining the transition impedance between two electrode parts of a subdivided neutral electrode used in high-frequency surgery. These makes it possible for the purely capacitive component of the transition imp... | 06/30/2009 |
| 7312554 | Piezoelectric devices and methods and circuits for driving same A drive circuit (18) senses a parameter of a piezoelectric actuator (14) operating in a device (10) and adjusts a drive signal of the piezoelectric actuator in accordance with the parameter. The drive circuit comprises a controller (100) ... | 12/25/2007 |
| 7298261 | Proximity sensor An operation section 2 is provided to a proximity sensor including: a detection section having an oscillation circuit 10; and an amplification section 2 having a function detecting a metal body using an oscillation amplitude of the oscillation c... | 11/20/2007 |
| 7235986 | Capacitive position sensing system with resonant amplification At least one exemplary embodiment of the present invention includes a capacitive sensing system, comprising a sensing conductor coupleable to a grounded target by a gap capacitance Cd, said grounded target separated from said sensing conductor by a gap ha... | 06/26/2007 |
| 7190511 | Fiber laser system with increased optical damage threshold The invention describes techniques for the control of the spatial as well as spectral beam quality of multi-mode fiber amplification of high peak power pulses as well as using such a configuration to replace the present diode-pumped, Neodynium based sources. Perfect... | 03/13/2007 |
| 6992492 | Capacitive sensor A capacitive sensor is disclosed that includes a variable capacitor transducer that varies its capacitance with changes in an environmental parameter. The present invention is adapted to measure any linear parameter such as pressure, force, or distance. The sensor o... | 01/31/2006 |
| 6940294 | Method and circuit for compensating MOSFET capacitance variations in integrated circuits A method for tracking the MOS oxide thickness by the native threshold voltage of a “native” MOS transistor without channel implantation for the purpose of compensating MOS capacitance variations is achieved. The invention makes use of the fact that in MOS device... | 09/06/2005 |
| 6852525 | Mammalian cell culture chamber The present invention relates to a cell culture chamber (10) having a sterile environment (12) for the culture of cells, a cover (14) for allowing for a transfer of pits and a sensor array. ... | 02/08/2005 |
| 6828801 | Capacitive sensor A capacitive sensor is disclosed that includes a variable capacitor transducer that varies its capacitance with changes in an environmental parameter. The present invention is adapted to measure any linear parameter such as pressure, force, or distance. The sensor t... | 12/07/2004 |
| 6774644 | Method and circuit for compensating MOSFET capacitance variations in integrated circuits A method for tracking the MOS oxide thickness by the native threshold voltage of a “native” MOS transistor without channel implantation for the purpose of compensating MOS capacitance variations is achieved. The invention makes use of the fact that in MOS device... | 08/10/2004 |
| 6714025 | Method and apparatus for synchronous demodulation of multiply modulated signals A method and an apparatus for synchronous demodulation of the multiply modulated rotation rate signal of a rotation rate sensor which comprises a spring-mass system that oscillates at its natural resonant frequency, and at least one capacitor for ascertaining a Cori... | 03/30/2004 |
| 6703674 | Electrical device A clock signal generator in an integrated circuit semiconductor device and a method of generating a clock signal, the clock signal generator comprising: a semiconductor substrate (2); an oscillator unit (4) which comprises at least one support member (10,... | 03/09/2004 |
| 6496020 | Method and apparatus for capacitance measurement of a dielectric medium utilizing the ratio of capacitance measurement made at different frequencies A method for analyzing a dielectric medium comprises the step of measuring, at one or more frequencies, the capacitance between a pair of electrodes immersed in the dielectric medium. The proportion of the or each capacitance measurement due to electrode ... | 12/17/2002 |
| 6382246 | Valve position detector A poppet valve moves up and down in a valve operating mechanism in an internal combustion engine. A cylindrical fixed electrode is fixed to a support plate on a cylinder head, and a cylindrical moving electrode is mounted to the lower surface of a valve s... | 05/07/2002 |
| 6293303 | Valve position detector A poppet valve moves up and down in a valve operating mechanism in an internal combustion engine. A fixed electrode is supported on a cylinder head, and a moving electrode is carried by the poppet valve. The fixed electrode is connected to a circuit, whic... | 09/25/2001 |
| 6054866 | Method and apparatus for measuring distance using capacitance characteristic Method and apparatus for measuring distance includes a capacitance probe positioned adjacent a rotating member and within the housing of the rotating member such that the distance between the probe and rotating member can be measured. The rotating member ... | 04/25/2000 |
| 6054864 | In-circuit capacitor checker A capacitor test apparatus for checking the capacitance of a capacitor without removing the capacitor from the circuit. Selection of the designated capacitance of the capacitor by means of a user-actuated selector switch automatically selects a test signa... | 04/25/2000 |
| 6046623 | Signal detecting circuit Between a reference voltage point and the emitter or the source of a transistor of which the collector or the drain is connected to a power source and to which an signal is input at its base or its gate, DC current passing means for causing a current to f... | 04/04/2000 |
| 5898298 | Inductor/capacitor-based measuring system for a moving body A measuring system measures forces, deformations, and movements. The measuring system comprises at least one LC-circuit, at least one power supply for generating a voltage and a current in the LC-circuits, whereby the frequency, the amplitude, and the pha... | 04/27/1999 |
| 5617020 | Microelectromechanical-based power meter A self-excited microelectromechanical device is described. The device includes a resonating structure, such as a cantilever, which responds to a physical phenomenon by generating an induced variable frequency voltage signal corresponding to the physical p... | 04/01/1997 |
| 5594331 | Microelectromechanical powerline monitoring apparatus A self-excited microelectromechanical device is described. The device includes a resonating structure, such as a cantilever, which responds to a physical phenomenon by generating an induced variable frequency voltage signal corresponding to the physical p... | 01/14/1997 |
| 5592098 | Channel forming fuel permittivity sensor with automatic temperature compensation A tubular single-layer winding coil is installed on the outer periphery of a thin wall portion of a cylindrical container case and a columnar electrode is provided at the center of the inside of the cylindrical container case. A fuel channel is formed bet... | 01/07/1997 |
| 5543722 | Channel forming fuel permittivity sensor with automatic temperature compensation A tubular single-layer winding coil is installed on the outer periphery of a thin wall portion of a cylindrical container case and a columnar electrode is provided at the center of the inside of the cylindrical container case. A fuel channel is formed bet... | 08/06/1996 |
| 5532605 | Container inspection apparatus having diameter measuring means and associated method Apparatus for inspecting non-round annular containers includes elongated capacitive sensors, cooperating oscillators, which convert the sensor signal to a voltage corresponding thereto, and an electronic processor which receives the voltage and determines... | 07/02/1996 |
| 5510720 | 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... | 04/23/1996 |
| 5414368 | Dielectric constant detecting apparatus A dielectric constant detecting apparatus comprises an LC circuit for shifting the phase of a high frequency voltage signal according to the dielectric constant of a liquid which passes between the coil and the electrode of the LC circuit. A resistor is c... | 05/09/1995 |
| 5414367 | Apparatus for detecting alcohol concentration in a mixed fuel An apparatus for detecting the concentration of alcohol mixed with gasoline or light oil comprises a dielectric constant detection device for providing a resonance frequency corresponding to the dielectric constant of the mixed fuel; a device for detectin... | 05/09/1995 |
| 5337017 | Apparatus for detecting alcohol content of liquid An apparatus for detecting an alcohol content of a liquid with high accuracy regardless of variance in a resonance frequency of a parallel resonance circuit constituted by inductance of a coil, capacity presented by a fluid within a liquid passage of a se... | 08/09/1994 |
| 5313168 | Apparatus for detecting fuel dielectric constant In a fuel dielectric constant detecting apparatus, a high frequency signal is applied to an element for subjecting the high frequency voltage signal to resonance corresponding to the dielectric constant of the fuel. A DC voltage is applied to the subjecti... | 05/17/1994 |
| 5245295 | Method of detecting a variation in stray capacitance by use of a PLL circuit Disclosed is a method of detecting a variation in stray capacitance by use of a PLL circuit. This method involves the steps of: setting respectively a freerunning frequency and a capture range of a phase-locked loop circuit so that a range in which an out... | 09/14/1993 |
| 5198777 | Paper thickness detecting apparatus having a resonator with a resonance point set by a capacitance detecting unit Apparatus for detecting thickness which includes an electrode detecting unit including a ground electrode and a detecting electrode. The electrodes oppose each other along a paper path. An oscillating circuit provides an oscillation frequency signal. A re... | 03/30/1993 |
| 5150062 | Electrostatic capacitance sensing circuit The electrostatic capacitance sensing circuit comprises a resonance circuit composed of an electrode capacitance formed by a substance to be measured and sandwiched between two opposing electrode plates and an inductance at least part of which is connecte... | 09/22/1992 |
| 5148125 | Dielectric constant monitor Monitoring of the average dielectric constant in an extended volume of a medium such as soil is achieved using an oscillator incorporating a transmission line to be embedded in the medium. The transmission line is connected as the feedback loop of an ampl... | 09/15/1992 |
| 5128622 | Multi-channel electrostatic sensor apparatus Disclosed is a multi-channel electrostatic sensor apparatus including a main oscillation circuit; a plurality of pull-in type sub-oscillation circuits which are adapted to synchronize with the main oscillation circuit to generate sub-frequency signals who... | 07/07/1992 |
| 5091704 | Oscillator having resonator coil immersed in a liquid mixture to determine relative amounts of two liquids An oscillator for use in a fluid detection apparatus for determining the respective percentages of first and second liquids in a mixture disposed within a chamber, including an inductive element immersed in the mixture such that the mixture at least parti... | 02/25/1992 |
| 5038110 | Circuit arrangement for signal recovery in a capacitive difference sensor A capacitive difference sensor includes two sensor electrodes, each of which lies opposite a transmitting electrode fed by an electrical AC voltage source. A circuit arrangment connected to the two sensor electrodes for signal recovery generates a differe... | 08/06/1991 |
| 4922182 | Auto reactance compensated non-contacting resistivity measuring device A device for measuring the resistivity of a conductive layer buried beneath an outer layer. The device is capacitively coupled to the buried layer by a driven electrode and a pickup electrode. An adjustable frequency source resonates the two electrodes wi... | 05/01/1990 |
| 4847551 | Apparatus for measuring capacitance of a low value three-terminal capacitor with a resonance technique The unknown capacitor or a standard capacitor are switched, one at a time, in parallel to a frequency setting circuit which sets the frequency of operation. The parallel combination of the unknown capacitor and the frequency setting circuit form a first p... | 07/11/1989 |
