US PATENT SUBCLASS 454 / 239
.~ Including automatic control means


Current as of: June, 1999
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454 /   HD   VENTILATION

237  DF  HAVING BOTH INLET AND OUTLET AIRWAYS {6}
239.~ Including automatic control means


DEFINITION

Classification: 454/239

Including automatic control means:

(under subclass 237) Subject matter comprising a means to sense a condition or change of condition which condition or change of condition may or may not occur, which means is effective to activate a separate means for regulating the quantity or direction of air flowing to or from the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

70+, for automatic pressure regulation of a vehicle ventilating system.

75, for automatic control of a vehicle ventilating system.

229, for automatic control of a forced recirculation ventilating system.

238, for automatic pressure regulation of a ventilating system having both inlet and outlet airways.

255, for automatic pressure regulation of a ventilating system having an inlet airway. 256, for automatic control of a ventilating system having an inlet airway.

340, for automatic pressure regulation of a ventilating system having an outlet airway.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation, appropriate subclasses for automatic control means for controlling temperature or humidity.