US PATENT SUBCLASS 324 / 658
.~.~ Using capacitive type measurement

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

600  DF  IMPEDANCE, ADMITTANCE OR OTHER QUANTITIES REPRESENTATIVE OF ELECTRICAL STIMULUS/RESPONSE RELATIONSHIPS {8}
649  DF  .~ Lumped type parameters {6}
658.~.~ Using capacitive type measurement {10}
659  DF  .~.~.~> With loss characteristic evaluation
660  DF  .~.~.~> With variable electrode area
661  DF  .~.~.~> With variable distance between capacitor electrodes {1}
663  DF  .~.~.~> Where a material or object forms part of the dielectric being measured {4}
676  DF  .~.~.~> With pulse signal processing circuit {2}
679  DF  .~.~.~> With comparison or difference circuit {1}
681  DF  .~.~.~> With frequency signal response, change or processing circuit {1}
683  DF  .~.~.~> With phase signal processing circuit
684  DF  .~.~.~> With compensation means {1}
686  DF  .~.~.~> With a capacitive sensing means {4}

DEFINITION

Classification: 324/658

Using capacitive type measurement:

(under subclass 649) Subject matter including the measuring of a property of an element, device or circuit which relates to its capacity to store electrical energy by means of an electric field.

(1) Note. Capacitors store energy in their electric fields while inductors store energy in their magnetic fields.

(2) Note. There are three factors that govern a capacitor's capacitance: a. the area (A) of parallel plates facing each other; b. the distance (D) between parallel plates; and c. the dielectric constant (E) of the insulating material between the plates.

SEE OR SEARCH CLASS

340, Communications: Electrical,

870.37, for a capacitive transmitter.