US PATENT SUBCLASS 340 / 545.4
.~.~.~.~.~ Sensing of electrical parameter (e.g., piezoelectricity or capacitance)

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
541  DF  .~.~ Intrusion detection {8}
545.1  DF  .~.~.~ Door or window movement {6}
545.2  DF  .~.~.~.~ Specified sensor {6}
545.4.~.~.~.~.~ Sensing of electrical parameter (e.g., piezoelectricity or capacitance)

DEFINITION

Classification: 340/545.4

Sensing of electrical parameter (e.g., piezoelectricity or capacitance):

(under subclass 545.2) Subject matter in which the movement is sensed according to a detected level of particular electrical power energy.

(1) Note. A piezoelectric or a capacitive sensing element is appropriate for this subclass; the mere making or breaking of an electrical circuit is insufficient for classification herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

561+, for intrusion detection by sensing the disturbance of an electric field in general.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing, appropriate subclasses for circuit testing by sensing electrical parameter.