US PATENT SUBCLASS 338 / 236
.~.~ Spacing of uniform thickness over length of element

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

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

DEFINITION

Classification: 338/236

(under subclass 234) Subject matter wherein the gaseous or vacuum spacing is of uniform thickness over the length of the resistance element.

(1) Note. The subject matter of this subclass usually involves a cylindrical or flat resistance element as formed by a rod-like resistance mass or a cylindrical or flattened cylindrical helix, with the uniform spacing extending between the outer surface of the element and the inner surface of the casing or housing. The spacing need not be uniform around the periphery of the resistance element, as when a flat resistance element is inclosed in a casing or housing whose inner surface is circularly cylindrical, for classification in this subclass.