(under the class definition) Subject matter including a base claimed, per se, usually of insulating material on which the resistance element may be wound or otherwise strung, and peculiarly adapted for this purpose and not classified elsewhere.
(1) Note. For classification here the claimed subject matter must be limited to the base core or frame, and exclude the resistance element. The combination of the resistance element together with the base, core, or frame is classified in the pertinent subclasses above, a few of the more pertinent subclasses being given in the Search Notes below. As between this subclass 321, and the insulators of special application in subclass 138 of Class 174, this subclass (321) includes insulators which are constituent parts of the resistor, as to have a resistance element wound or strung thereon. However, an insulator for supporting a resistance wire at one point thereon, this wire being strung in space in the manner of an aerial electrical conductor is not classified here; but in Class 174, subclass 138. See also the Search Notes under subclass 138 of Class 174.
SEE OR SEARCH THIS CLASS, SUBCLASS:
283+, for resistors whose elements are strung on a base in zigzag or sinuous fashion.
296+, for resistors whose elements are wound or otherwise helically disposed on a core.
306+, for resistors whose element extends along a base.
315+, for resistors whose element is combined with a mounting or supporting means.
SEE OR SEARCH CLASS
174, Electricity: Conductors and Insulators, especially
138, for insulators of special application. See also (1) Note above.
242, Winding, Tensioning, or Guiding,
600+, and 118+ for a spool upon which a resistor may be wound, usually for temporary storage.
248, Supports,
49+, for cable supports, and subclasses 200+ for brackets.
373, Industrial Electric Heating Furnaces,
117+, for resistance elements and mountings for the same when peculiar to or combined with electric furnace structure or control for electric furnaces.
