US PATENT SUBCLASS 338 / 296
HELICAL OR WOUND RESISTANCE ELEMENT

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

296HELICAL OR WOUND RESISTANCE ELEMENT {7}
297  DF  .~> Flat spiral winding
298  DF  .~> Compound helix or winding
299  DF  .~> Plural supported helices or windings
300  DF  .~> Element forms a coating
301  DF  .~> Element coiled on flat or ribbon base
302  DF  .~> Element coiled on cylindrical or prismatic core {1}
304  DF  .~> Element on frame or support {1}

DEFINITION

Classification: 338/296

(under the class definition) Subject matter wherein an elongated resistance element is formed as two or more continuous closed coils or loops as a spiral, helix, or toroidal winding.

(1) Note. In the subject matter of this and the indented subclasses the coils are substantially closed, any opening being for continuing the resistance element to the next turn. In zigzag or sinuous resistors in subclasses 283+ above, the loops are open at one end, and may in addition include sharp changes in the direction of the elongated resistance elements. While the helical or wound resistors in this subclass may be flattened, there is an appreciable thickness, as opposed to the zigzag or sinuous type in subclasses 283+ above, where the element may lie substantially in one plane or all portions of the element substantially coincide along the longitudinal axis of zigzag or sinusoid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

58, for ventilated helical resistors.

62+, for resistors with helical or wound elements with inductance reducing means.

68+, for mechanically variable resistors which may include a helical winding.

207, for a resistor whose element and/or base is permanently folded or rolled.

208+, for mesh, woven, or braided resistors.

214, for cable type resistors which may include a helical resistance element.

218, for helical or wound tapered resistors.

263+, and 267+, for helical or wound resistors which are embedded, incased, or housed.

278, for resistors with edgewise coiled helical strip resistance elements.

282, for helical or wound resistors formed as a bent ribbon.

283+, for zigzag or sinuous shaped resistors; and especially subclass 286 for such resistors including a helical winding pattern. See also (1) Note above.

321, for cores and frames for helical or wound resistors.

SEE OR SEARCH CLASS

29, Metal Working,

610.1+, for methods of making helical or wound resistors involving metal working and assembly, and subclass 618 for such methods with winding together with enveloping or housing. 174, Electricity: Conductors and Insulators,

138, for insulators, per se, upon which a resistor may be wound.

242, Winding, Tensioning, or Guiding,

430+, for a process or apparatus for forming an article by winding material onto a core.

336, Inductor Devices, appropriate subclasses for inductor devices which may be helical or wound.

428, Stock Material or Miscellaneous Articles,

592, for metallic stock either in the form of a helix or having a helical component.