US PATENT SUBCLASS 338 / 223
GRANULAR OR POWDERED ELEMENT


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

223GRANULAR OR POWDERED ELEMENT {2}
224  DF  .~> Granular or powdered mixtures
225  DF  .~> Carbon particles


DEFINITION

Classification: 338/223

(under the class definition) Subject matter wherein the resistance element is granular or powdered in final form.

(1) Note. Subject matter wherein an inert, granular grain

base material is impregnated or coated with a resistive layer such that a resistive film or coating is formed on the individual granular base grains, is properly classified in this subclass, unless otherwise provided for above.

(2) Note. When the element is formed as a compacted mass of powdered or granular material classification is in this subclass, if some retaining means such as a casing is required to maintain the mass in its formed shape, i.e., the compacted mass crumbles to a powder or to grains when the retaining structure is removed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1, for coherer type resistors whose element is granular or powdered.

54, for resistors with granular or powdered elements and with cooling gas or liquid circulation. 88, for penetrating type mechanically variable resistors having powdered elements.

100, for a compressible type variable resistor whose element is granular or powdered.

SEE OR SEARCH CLASS

75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

228+, for a consolidated metal powder composition.

178, Telegraphy,

117, for alternating or pulsating current telegraphy systems using a coherer.

219, Electric Heating,

552, for electric heaters including granular or powdered resistors.

361, Electricity: Electrical Systems and Devices,

126+, for high voltage dissipators which may include a granular or powdered resistor.