US PATENT SUBCLASS 340 / 551
.~.~.~ Disturbance of magnetic 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}
551.~.~.~ Disturbance of magnetic field

DEFINITION

Classification: 340/551

Disturbance of magnetic field:

(under subclass 541) Subject matter responsive to the change of a magnetic field caused by the presence or motion of an intruder.

SEE OR SEARCH CLASS

324, Electricity: Measuring and Testing,

200+, for magnetic field testing or measurement.