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Class Information
Number: 324/675
Name: Electricity: measuring and testing > Impedance, admittance or other quantities representative of electrical stimulus/response relationships > Lumped type parameters > Using capacitive type measurement > Where a material or object forms part of the dielectric being measured > By 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 |
| 7605593 |
Method and apparatus for detecting inconsistencies in cured resin structures |
Oct. 20, 2009 |
| 6943567 |
Method for detecting the operability of a number of identical zener diodes that are connected in parallel to one another and to a solenoid |
Sep. 13, 2005 |
| 6856143 |
System and method for measuring a capacitance of a conductor |
Feb. 15, 2005 |
| 6842009 |
Biohazard sensing system and methods thereof |
Jan. 11, 2005 |
| 6559656 |
Permittivity measurement of thin films |
May. 6, 2003 |
| 6496020 |
Method and apparatus for capacitance measurement of a dielectric medium utilizing the ratio of capacitance measurement made at different frequencies |
Dec. 17, 2002 |
| 6483323 |
Projectile with variable target transition detection capability and method therefor |
Nov. 19, 2002 |
| 6414497 |
Paving material analyzer system and method |
Jul. 2, 2002 |
| 6046623 |
Signal detecting circuit |
Apr. 4, 2000 |
| 5625294 |
Apparatus for detecting seated condition for toilet seat |
Apr. 29, 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 |
| 5418467 |
Apparatus and method of checking the thickness and uniformity of a coating deposited on an elongated insulating body using a condenser sensor as part of a resonant electrical circuit |
May. 23, 1995 |
| 5414368 |
Dielectric constant detecting apparatus |
May. 9, 1995 |
| 5397994 |
Moisture measurement gauge for particulates including a transmission line forming part of a resonant circuit |
Mar. 14, 1995 |
| 5325067 |
Apparatus for matching impedance in an electrostatic sensor |
Jun. 28, 1994 |
| 5321366 |
Capacitance sensor apparatus of divided multi-electrode type |
Jun. 14, 1994 |
| 5276431 |
Security tag for use with article having inherent capacitance |
Jan. 4, 1994 |
| 5269175 |
Sensor for investigating liquids |
Dec. 14, 1993 |
| 5245295 |
Method of detecting a variation in stray capacitance by use of a PLL circuit |
Sep. 14, 1993 |
| 5231359 |
Ceramic resonance type electrostatic sensor apparatus |
Jul. 27, 1993 |
| 5198777 |
Paper thickness detecting apparatus having a resonator with a resonance point set by a capacitance detecting unit |
Mar. 30, 1993 |
| 5196799 |
Method and apparatus for testing a protective barrier material for pinholes and tear strength |
Mar. 23, 1993 |
| 5157337 |
Dielectric constant measurement probe assembly and apparatus and method |
Oct. 20, 1992 |
| 5150062 |
Electrostatic capacitance sensing circuit |
Sep. 22, 1992 |
| 5038110 |
Circuit arrangement for signal recovery in a capacitive difference sensor |
Aug. 6, 1991 |
| 4912976 |
Liquid level sensing apparatus |
Apr. 3, 1990 |
| 4914377 |
Radio frequency capacitance probe system for material detection |
Apr. 3, 1990 |
| 4908574 |
Capacitor array sensors for determining conformity to surface shape |
Mar. 13, 1990 |
| 4782282 |
Capacitive-type seed sensor for a planter monitor |
Nov. 1, 1988 |
| 4471295 |
Device for detecting the variation of a capacitive impedance having dielectric consisting of a lubricant |
Sep. 11, 1984 |
| 4391146 |
Parallel T impedance measurement circuit for use with variable impedance sensor |
Jul. 5, 1983 |
| 4345203 |
Device for measuring the lubrication of surfaces rolling or sliding relative to each other and lubricated with a lubricant |
Aug. 17, 1982 |
| 4295092 |
Apparatus for and method of detecting and measuring corrosion damage in pipe |
Oct. 13, 1981 |
| 4208624 |
Method and apparatus for investigating dielectric semiconductor materials |
Jun. 17, 1980 |
| 4152641 |
Method and apparatus for the determination of signal pickup qualities of a stylus of a capacitive disc video player |
May. 1, 1979 |
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