US PATENT SUBCLASS 375 / 264
.~.~.~ Multilevel

Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS

259  DF  SYSTEMS USING ALTERNATING OR PULSATING CURRENT {4}
260  DF  .~ Plural channels for transmission of a single pulse train {2}
261  DF  .~.~ Quadrature amplitude modulation {4}
264.~.~.~ Multilevel

DEFINITION

Classification: 375/264

Multilevel:

(under subclass 261) Subject matter in which the transmitted pulse waveform has more than two discrete amplitude levels.