US PATENT SUBCLASS 381 / 123
SWITCHING

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

123SWITCHING

DEFINITION

Classification: 381/123

SWITCHING:

(under the class definition) Subject matter where there is the making, breaking or changing connections in an electrical circuit.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7+, for switch type stereo modulators or detectors.

11, for switching between mono and stereo modes.

55, for audio transducer protection circuitry.

81, for switching in multiple channel program distribution.

85, for speaker or channel switching in a public address system.

110, for voice controlled switching of audio systems. SEE OR SEARCH CLASS

200, Electricity: Circuit Makers and Breakers, for switches, per se.

307, Electrical Transmission or Interconnection Systems,

112+, for electrical transmission or interconnection switching systems.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

365+, for miscellaneous gating circuits including channel selection.

335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets for magnetic switches.

340, Communications: Electrical,

825.01, for spare channel switching.

361, Electricity: Electrical Systems and Devices,

139+, for relay or solenoid circuits. 370, Multiplex Communications,

357+, for multiplex switching circuit.

379, Telephonic Communications,

242+, for switching in telephone systems, and subclass 325 for telephone switches, per se.

455, Telecommunications,

78+, for transmitter-receiver switching.

714, Error Detection/Correction and Fault Detection/Recovery,

3+, for replacing a faulty apparatus with a spare.