US PATENT SUBCLASS 338 / 234
.~ With gaseous or vacuum spacing between element and casing or housing

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

226  DF  INCASED, EMBEDDED, OR HOUSED {22}
234.~ With gaseous or vacuum spacing between element and casing or housing {2}
235  DF  .~.~> Plural elements or resistors
236  DF  .~.~> Spacing of uniform thickness over length of element {1}

DEFINITION

Classification: 338/234

(under subclass 226) Subject matter wherein a vacuum or gaseous spacing exists between the outer surface of the resistance element and the inner surface of the external casing or housing.

(1) Note. For classification in this subclass, the gaseous or vacuum spacing must extend over substantially the entire adjacent surfaces of the external casing or housing and element. There must be no direct contact between the element and casing or housing. However, the intervening space need not be entirely gaseous or vacuum. Spacing elements may be inserted between the element and casing or housing to maintain the spaced relation, provided only a relatively small portion of the vacuum or gaseous space is devoted to this purpose. Where the casing is extended through the interior of the resistance element, the element may directly engage the portion extending therethrough, as being wound thereon, and yet be classified in this subclass. Air spacing is considered to be gaseous spacing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

34, for resistors whose value is responsive to gas, vapor, or moisture.

36+, for resistors whose value is responsive to a fluid or gas pressure.

53+, for resistors in a gas cooling medium or with ventilated passages.

57, for resistors with a vented or ventilating casing or housing.

231, for resistors whose element is embedded, incased, or housed in liquid.

238+, for resistors whose element is embedded in powdered insulating material with an outer metallic sheath.

SEE OR SEARCH CLASS

174, Electricity: Conductors and Insulators,

17+, for boxes and housing with a fluid or vacuum and limited to electrical use; and subclasses 50.5+ for hermetically sealed envelope type boxes and housings.

219, Electric Heating,

366+, for electric heaters utilizing gaseous or vacuum spaces, as to control the direction of the heat.

313, Electric Lamp and Discharge Devices, for electric lamp and discharge devices utilizing an envelope enclosing a vacuum or gaseous space.