US PATENT SUBCLASS 340 / 528
.~.~.~ Entrance/exit

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

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
501  DF  .~ With particular system function (e.g., temperature compensation, calibration) {8}
527  DF  .~.~ Time delay {2}
528.~.~.~ Entrance/exit

DEFINITION

Classification: 340/528

Entrance/exit:

(under subclass 527) Subject matter where the time delay allows an authorized person to either disarm the alarm or exit a protected area before the humanly perceptible signal is actuated.