US PATENT SUBCLASS 361 / 178
.~.~.~ Fluid (e.g., liquid level, humidity)

Current as of: June, 1999
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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

139  DF  CONTROL CIRCUITS FOR ELECTROMAGNETIC DEVICES {7}
160  DF  .~ For relays or solenoids {11}
170  DF  .~.~ Condition responsive (e.g., external circuit condition) {9}
178.~.~.~ Fluid (e.g., liquid level, humidity)

DEFINITION

Classification: 361/178

Fluid (e.g., liquid level, humidity):

(under subclass 170) Subject matter wherein the initiating device or circuit is responsive to the condition of a fluid (liquid or gas).

(1) Note. The system may, for example, respond to precipitation, fluid level or flow, humidity of fluid pressure.

SEE OR SEARCH CLASS

340, Communications: Electrical,

602, for moisture or humidity; subclass 604 for wetness; and

subclasses 618+ for liquid level alarm systems, respectively.