US PATENT SUBCLASS 375 / 281
.~.~.~.~ Quaternary

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

259  DF  SYSTEMS USING ALTERNATING OR PULSATING CURRENT {4}
271  DF  .~ Angle modulation {2}
279  DF  .~.~ Phase shift keying {4}
280  DF  .~.~.~ More than two phases {1}
281.~.~.~.~ Quaternary

DEFINITION

Classification: 375/281

Quaternary:

(under subclass 280) Subject matter where the phases are 90 degrees apart.