US PATENT SUBCLASS 204 / 661
.~.~ With control means responsive to sensed condition

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

193  DF  APPARATUS {5}
660  DF  .~ Apparatus for electrical (including simultaneous electrical and magnetic) separation or purification of liquid or magnetic treatment of liquid (other than separation) {10}
661.~.~ With control means responsive to sensed condition {1}
662  DF  .~.~.~> Liquid level sensing means

DEFINITION

Classification: 204/661

With control means responsive to sensed condition:

(under subclass 660) Apparatus in which means are provided to detect an apparatus or process characteristic or change therein and to control or regulate operation of the apparatus or process based on the detected characteristic or change therein.

(1) Note. A single means may be used both to detect an apparatus or process characteristic or a change in a characteristic and to implement an action in the process based upon the detected characteristic or change therein. There must be a positive action made by a control means because of the detected characteristic or change therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

556, for similar corresponding processes with control responsive to a measured parameter.

SEE OR SEARCH CLASS

73, Measuring and Testing, as the residual class for processes and apparatus for measuring or testing, per se. Also see the (3) Note in the class definition of Class 73 for additional loci of other measuring and testing processes and apparatus of different types.

323, Electricity: Power Supply or Regulation Systems, 220, 354 for miscellaneous systems for controlling the current and/or voltage in a single circuit.

324, Electricity: Measuring and Testing, for measuring, testing, or sensing, per se, to determine electrical properties by electrical means even though nonelectrical values may be derived from the electrical properties determined.