US PATENT SUBCLASS 340 / 825.48
.~.~.~ Tone code

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

825  DF  SELECTIVE {23}
825.36  DF  .~ Having indication or alarm (e.g., location indication) {4}
825.44  DF  .~.~ Code responsive (e.g., paging) {4}
825.48.~.~.~ Tone code

DEFINITION

Classification: 340/825.48

Tone code:

(under subclass 825.44) Subject matter wherein the control signal is a predetermined pattern of successive audio frequency modulated signals.

(1) Note. The successive signals may include one or more frequencies, but a single modulated signal is not classified herein.