US PATENT SUBCLASS 379 / 93.35
.~.~.~.~ Having call-waiting

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  DF  .~.~ By voice frequency signal (e.g., tone code) {3}
93.28  DF  .~.~.~ Modulated audio tone {4}
93.35.~.~.~.~ Having call-waiting

DEFINITION

Classification: 379/93.35

Having call-waiting:

(under subclass 93.28) Subject matter for signalling a first station in communication with a second station that a third station desires communication with the first station.

SEE OR SEARCH THIS CLASS, SUBCLASS:

215, for call waiting with telephone equipment.

SEE OR SEARCH CLASS

370, Multiplex Communications,

259+, for special services.

455, Telecommunications,

414+, for special services in a radiotelephone system.