US PATENT SUBCLASS 338 / 78
.~ With current reversing (e.g., reversing rheostat)


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

68  DF  MECHANICALLY VARIABLE (E.G., RHEOSTAT) {24}
78.~ With current reversing (e.g., reversing rheostat)


DEFINITION

Classification: 338/78

(under subclass 68) Subject matter wherein a resistor or plurality of resistors as there defined is combined with or includes an electric switch in a common electric circuit, the switch being effective to reverse the electric current at the output terminals of the resistor with respect to the current applied at the input terminals.

(1) Note. Usually the resistor and switch have a common actuator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

200+, for mechanically adjustable or variable resistors combined with switches in general. See the Search Notes under this subclass for a more extended field of search for a variable resistor combined with a switch.

215, for a fixed resistor combined with a switch. See also the Search Notes under this subclass for a more extended field of search for this combination.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems, 293+, and 300 for motor reversing systems which involve reversal of the armature or field current.