US PATENT SUBCLASS 338 / 53
WITH COOLING GAS OR LIQUID CIRCULATION

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

53WITH COOLING GAS OR LIQUID CIRCULATION {4}
54  DF  .~> Element granular, powdered, or stacked between terminals
55  DF  .~> With cooling liquid circulation {1}
57  DF  .~> Vented or ventilating casing or housing
58  DF  .~> Ventilated helical or zigzag element

DEFINITION

Classification: 338/53

(under the class definition) Subject matter wherein the resistor includes structure which conveys a cooling gas or liquid to, from or through the resistor, or which permits a cooling gas or liquid to move to or from the resistor for the purpose of cooling the resistor by conveying away the heat produced by the resistor.

(1) Note. Subject matter in this subclass is very similar to subject matter in Class 219, Electric Heating, subclasses 50+, since cooling a resistor by gas or liquid is analogous to heating gas or liquid with a resistor. In the resistors in this subclass (53) the heat produced is usually incidental and undesired, and the fluid or gas dissipates this heat. In the heating resistors of Class 219 the resistor is adapted for heating purposes as opposed to impedance purposes, and

the heat produced is distributed or directed for such heating purposes as opposed to mere dissipation. However, a mere resistor with heating or cooling fluid or gas circulation, even though designated as a heater, is classified in this subclasses (53+). For classification in Class 219, structure must be claimed which adapts the resistor, or the fluid gas circulating structure for heating purposes. See also the Notes under the Class Definition for the general lines between this class (338) and Class 219.

(2) Note. A resistor with a liquid gas or vacuum enclosing casing is not classified here even though the liquid or gas is of heat conducting material, but in such subclasses as 231 and 234+ below. For classification in this subclasses (53+) the liquid or gas must circulate.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7+, for resistors with temperature compensation.

231, for resistors generally whose elements are incased in a liquid. See also (2) Note above. 234+, for resistors generally with a gaseous or vacuum spacing between the element and the casing or housing. See also (2) Note above.

SEE OR SEARCH CLASS

62, Refrigeration, appropriate subclasses, for refrigeration devices.

165, Heat Exchange, appropriate subclass for heat transferring devices generally.

219, Electric Heating, especially

50+, and 280+ for electric resistance air and liquid heaters. See also (1) Note above.