US PATENT SUBCLASS 338 / 238
.~ Element inpowdered insulation with outer metallic sheath

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

226  DF  INCASED, EMBEDDED, OR HOUSED {22}
238.~ Element inpowdered insulation with outer metallic sheath {3}
239  DF  .~.~> Plural elements or resistors
240  DF  .~.~> Terminals or leads adjacent {1}
242  DF  .~.~> Shape of sheath

DEFINITION

Classification: 338/238

(under subclass 226) Subject matter wherein the casing or housing constitutes a metallic sheath with powdered insulation therein, the resistance element being embedded in the powdered insulation and insulated from the metallic sheath.

(1) Note. The insulation must be in powdered form in the finished resistor, as opposed to being added in powdered form and hardened as by molding, the latter subject matter being in subclasses 243+ below. However a compacted mass of powder is still considered powder for classification here, if the mass breaks done into powder upon removal of any restraining structure.

(2) Note. See the search note to Class 174, below for the line with this subclass and its indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

54, 88, 100, and 223+, for resistors with granular or powdered elements.

64+, for resistors with electrical shielding. 214, for cable type resistors. 243+, for resistors generally whose element is embedded in insulation with a metallic sheath.

256+, for incased, embedded, or housed resistors, the casing or housing being in plural layers.

277+, for resistors with mechanical protecting structure such as a guard, screen, or shield.

SEE OR SEARCH CLASS

29, Metal Working,

614+, for methods of making and assembly of resistors involving enveloping by filling with powdered insulation; and subclasses 616+ for such methods involving the powdering insulation.

156, Adhesive Bonding and Miscellaneous Chemical Manufacture,

47+, for making and/or joining of electrical conductors of indefinite length.

174, Electricity: Conductors and Insulators, especially

74+, for conduits, cables and conductors with end structure; subclass 98 with embedded conduit-duct or conductor; and subclasses 102+ for conduits, cables, or conductors with conductive armor or sheath. Subclasses 102+ include cables with a conductor, metallic sheath, and powdered insulation

therebetween. Subclass 75 includes cables of this type with end structure and joint, and in subclass 77 cables of this type with end structure and seal. The mere recitation of such terms as resistance, resistance element, helical resistance, coil resistance, or a terminal at one end of the sheathed resistor does not preclude classification in these subclasses as opposed to these subclasses (238+). For classification in subclasses 238+ significant resistance structure or configuration must be recited, as the resistor having a zigzag pattern, or wound on a core. The recited combination of a resistor broadly with a terminal at each end is classified in subclasses 238+ as opposed to Class 174. However, where a resistor is disclosed, but is only claimed as conductor, or wire, or in similar nomenclature, together with one or more terminals classification is in Class 174, especially subclasses 70+.

219, Electric Heating, 200+, and especially subclass 546+ for electric heaters with a metallic sheath over powdered insulation.

252, Compositions,

63.2, for powdered dielectric or electrically insulating compositions.