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Class Information
Number: 324/682
Name: Electricity: measuring and testing > Impedance, admittance or other quantities representative of electrical stimulus/response relationships > Lumped type parameters > Using capacitive type measurement > With frequency signal response, change or processing circuit > Including a tuned or resonant circuit
Description: Subject matter including a circuit which typically contains both inductance and capacitance and is tuned to resonate at a certain frequency.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7554341 |
Method and measurement apparatus for determining the transition impedance between two parts of a subdivided neutral electrode |
Jun. 30, 2009 |
| 7298261 |
Proximity sensor |
Nov. 20, 2007 |
| 7235986 |
Capacitive position sensing system with resonant amplification |
Jun. 26, 2007 |
| 6992492 |
Capacitive sensor |
Jan. 31, 2006 |
| 6940294 |
Method and circuit for compensating MOSFET capacitance variations in integrated circuits |
Sep. 6, 2005 |
| 6852525 |
Mammalian cell culture chamber |
Feb. 8, 2005 |
| 6828801 |
Capacitive sensor |
Dec. 7, 2004 |
| 6774644 |
Method and circuit for compensating MOSFET capacitance variations in integrated circuits |
Aug. 10, 2004 |
| 6714025 |
Method and apparatus for synchronous demodulation of multiply modulated signals |
Mar. 30, 2004 |
| 6703674 |
Electrical device |
Mar. 9, 2004 |
| 6496020 |
Method and apparatus for capacitance measurement of a dielectric medium utilizing the ratio of capacitance measurement made at different frequencies |
Dec. 17, 2002 |
| 6382246 |
Valve position detector |
May. 7, 2002 |
| 6293303 |
Valve position detector |
Sep. 25, 2001 |
| 6054864 |
In-circuit capacitor checker |
Apr. 25, 2000 |
| 6054866 |
Method and apparatus for measuring distance using capacitance characteristic |
Apr. 25, 2000 |
| 6046623 |
Signal detecting circuit |
Apr. 4, 2000 |
| 5898298 |
Inductor/capacitor-based measuring system for a moving body |
Apr. 27, 1999 |
| 5617020 |
Microelectromechanical-based power meter |
Apr. 1, 1997 |
| 5594331 |
Microelectromechanical powerline monitoring apparatus |
Jan. 14, 1997 |
| 5592098 |
Channel forming fuel permittivity sensor with automatic temperature compensation |
Jan. 7, 1997 |
| 5543722 |
Channel forming fuel permittivity sensor with automatic temperature compensation |
Aug. 6, 1996 |
| 5532605 |
Container inspection apparatus having diameter measuring means and associated method |
Jul. 2, 1996 |
| 5510720 |
Device for detecting attempts at fraud on an apparatus for reading and writing on a chip card |
Apr. 23, 1996 |
| 5414367 |
Apparatus for detecting alcohol concentration in a mixed fuel |
May. 9, 1995 |
| 5414368 |
Dielectric constant detecting apparatus |
May. 9, 1995 |
| 5337017 |
Apparatus for detecting alcohol content of liquid |
Aug. 9, 1994 |
| 5313168 |
Apparatus for detecting fuel dielectric constant |
May. 17, 1994 |
| 5245295 |
Method of detecting a variation in stray capacitance by use of a PLL circuit |
Sep. 14, 1993 |
| 5198777 |
Paper thickness detecting apparatus having a resonator with a resonance point set by a capacitance detecting unit |
Mar. 30, 1993 |
| 5150062 |
Electrostatic capacitance sensing circuit |
Sep. 22, 1992 |
| 5148125 |
Dielectric constant monitor |
Sep. 15, 1992 |
| 5128622 |
Multi-channel electrostatic sensor apparatus |
Jul. 7, 1992 |
| 5091704 |
Oscillator having resonator coil immersed in a liquid mixture to determine relative amounts of two liquids |
Feb. 25, 1992 |
| 5038110 |
Circuit arrangement for signal recovery in a capacitive difference sensor |
Aug. 6, 1991 |
| 4922182 |
Auto reactance compensated non-contacting resistivity measuring device |
May. 1, 1990 |
| 4847551 |
Apparatus for measuring capacitance of a low value three-terminal capacitor with a resonance technique |
Jul. 11, 1989 |
| 4806848 |
Compressor blade clearance measurement system |
Feb. 21, 1989 |
| 4661797 |
Electronic warning and monitoring apparatus and electrode arrangement therefor |
Apr. 28, 1987 |
| 4604898 |
Pressure measuring device |
Aug. 12, 1986 |
| 4555941 |
Capacitance-type material level indicator |
Dec. 3, 1985 |
| 4555661 |
Method and apparatus for determining dielectric constant |
Nov. 26, 1985 |
| 4507608 |
Method and arrangement using a pair of resonant circuits for determining and indicating the position of an uneveness in the inner surface of pipes or other types of cylindrical structures |
Mar. 26, 1985 |
| 4499767 |
Capacitance-type material level indicator |
Feb. 19, 1985 |
| 4499640 |
Method of manufacturing capacitance-type material level indicator probe |
Feb. 19, 1985 |
| 4499766 |
Capacitance-type material level indicator |
Feb. 19, 1985 |
| 4482859 |
Object displacement sensor and device for measuring the rotation speed and vibration frequency of a rotor |
Nov. 13, 1984 |
| 4391146 |
Parallel T impedance measurement circuit for use with variable impedance sensor |
Jul. 5, 1983 |
| 4377785 |
Device for diagnosing ignition system for use in internal combustion engine |
Mar. 22, 1983 |
| 4352060 |
Apparatus for measuring the interior dimensions of a cast iron mold |
Sep. 28, 1982 |
| 4310806 |
Device for detecting linear displacement |
Jan. 12, 1982 |
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