US PATENT SUBCLASS 340 / 544
.~.~.~ Disturbance of fluid pressure

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}
544.~.~.~ Disturbance of fluid pressure

DEFINITION

Classification: 340/544

Disturbance of fluid pressure:

(under subclass 541) Subject matter wherein the intrusion is detected by a pressure sensing device responsive to confined fluid under superatmosphere, subatmosphere, or time-varying pressure.

(1) Note. The confined fluid may be within a barrier bounding the protected area or within the entire area.

SEE OR SEARCH THIS CLASS, SUBCLASS:

626, for pressure responsive indication of more general utility.