US PATENT SUBCLASS 34 / 524
.~ With automatic control

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
524.~ With automatic control {11}
525  DF  .~.~> By web breaking
526  DF  .~.~> Of plural operations {3}
548  DF  .~.~> Of gas mixing
549  DF  .~.~> Of heater {7}
557  DF  .~.~> Of contacting gas humidity
558  DF  .~.~> Of gas or vapor pressure in treating enclosure {1}
560  DF  .~.~> Of rate of treated material motion {1}
562  DF  .~.~> Of time period {1}
565  DF  .~.~> Of flow of gas or vapor treating fluid {6}
572  DF  .~.~> Of starting or stopping
573  DF  .~.~> Of treated material feeding or discharging {2}

DEFINITION

Classification: 34/524

With automatic control:

(under subclass 523) Apparatus combined with means to sense a condition or change of condition and cause a control operation, including timing means which is other than the drive means for the machine.

(1) Note. The "condition" sensed may be any condition or property of the material undergoing treatment, of the treating medium, or of the operation of the apparatus.

(2) Note. Unless otherwise clearly indicated by title and definition, classification is on the basis of the condition controlled, and not the means employed or the condition sensed, for example, humidistatic means to control a heater is in subclass 557.

(3) Note. For mere periodic sequential or other operation of the machine due to its drive mechanism or to manual intervention, see appropriate apparatus subclasses of this class, such as 87, 143+, and 191.

(4) Note. Apparatus disclosed for all subject matter elsewhere classified in this class is appropriately cross-referenced except to subclasses 467+, which must be searched for complete search on treatment of gas or vapor.

SEE OR SEARCH CLASS

73, Measuring and Testing, 335+, for hygrometers and hygrostats.

165, Heat Exchange,

200+, for an automatically controlled heat exchanger.

236, Automatic Temperature and Humidity Regulation, for temperature and humidity responsive means and systems.

237, Heating Systems,

2+, for an automatically controlled heating system.

337, Electricity: Electrothermally or Thermally Actuated Switches,

98+, for a thermostatic switch.

374, Thermal Measuring and Testing,

100+, for a thermometer.