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Class Information
Number: 381/
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic

Sub-classes under this class:

Class Number Class Name Patents
381/28 Amplifier 141
381/2 Broadcast or multiplex stereo 307
381/27 Center channel 156
381/23.1 Hearing aid 143
381/17 Pseudo stereophonic 788
381/19 Quadrasonic 202
381/26 Stereo sound pickup device (microphone) 160
381/300 Stereo speaker arrangement 299

Patents under this class:

Patent Number Title Of Patent Date Issued

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