US PATENT SUBCLASS 340 / 511
.~.~.~ Threshold or window (e.g., of analog electrical level)

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}
506  DF  .~.~ Alarm system supervision {7}
511.~.~.~ Threshold or window (e.g., of analog electrical level)

DEFINITION

Classification: 340/511

Threshold or window (e.g., of analog electrical level):

(under subclass 506) Subject matter wherein the supervisory circuit is coupled to the primary alarm circuit and is responsive to the signal therein attaining a predetermined level or range of levels.