US PATENT SUBCLASS 455 / 400
HAVING SINGLE-CHANNEL TELEPHONE CARRIER

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

400HAVING SINGLE-CHANNEL TELEPHONE CARRIER {2}
401  DF  .~> Including call signaling (e.g., ringing, off-hook, dialing)
402  DF  .~> Over power line

DEFINITION

Classification: 455/400

HAVING SINGLE-CHANNEL TELEPHONE CARRIER:

(under the class definition) Subject matter wherein a single telephone speech signal on wired link modulates a carrier signal which has a frequency above the range of human audibility.

SEE OR SEARCH CLASS

370, Multiplex Communications,

485+, for transmission of more than a single telephone signal on a carrier.