US PATENT SUBCLASS 379 / 93.26
.~.~ By voice frequency signal (e.g., tone code)

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

90.01  DF  TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE) {8}
93.01  DF  .~ Having transmission of a digital message signal over a telephone line {9}
93.26.~.~ By voice frequency signal (e.g., tone code) {3}
93.27  DF  .~.~.~> Alphanumeric
93.28  DF  .~.~.~> Modulated audio tone {4}
93.37  DF  .~.~.~> Having acoustic link

DEFINITION

Classification: 379/93.26

By voice frequency signal (e.g., tone code):

(under subclass 93.01) Subject matter wherein the pulse or data signal is specifically described as converted into one or more tones lying within the audible frequency spectrum.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

219+, for modems and digital transceivers, per se.