US PATENT SUBCLASS 340 / 561
.~.~.~ Disturbance of electric field

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}
561.~.~.~ Disturbance of electric field {1}
562  DF  .~.~.~.~> Capacitance {2}

DEFINITION

Classification: 340/561

Disturbance of electric field:

(under subclass 541) Subject matter responsive to the disturbance of an electric field (e.g., capacitance).

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

116+, for a proximity responsive switching system.

361, Electricity: Electrical Systems and Devices,

179+, for proximity responsive relay systems.