US PATENT SUBCLASS 340 / 506
.~.~ Alarm system supervision

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.~.~ Alarm system supervision {7}
507  DF  .~.~.~> Fail-safe
508  DF  .~.~.~> Redundant (e.g., added circuit or loop)
509  DF  .~.~.~> Plural or diverse current sources
510  DF  .~.~.~> Bridge or potential divider
511  DF  .~.~.~> Threshold or window (e.g., of analog electrical level)
512  DF  .~.~.~> Pulse
513  DF  .~.~.~> Diode

DEFINITION

Classification: 340/506

Alarm system supervision:

(under subclass 501) Subject matter where there is continuous monitoring of the operativeness of the alarm circuits in the system.

(1) Note. The system having its operativeness monitored is referred to as the "primary system" in the definitions of of the subclasses indented hereunder.

(2) Note. Supervision should be distinguished from automatic testing of the system as in subclass 516 below, in that, supervision implies continuous surveillance of the system while automatic testing is periodic.

SEE OR SEARCH THIS CLASS, SUBCLASS:

635+, for monitoring of a system in which the combination to form a condition responsive primary alarm system is not recited.