US PATENT SUBCLASS 455 / 38.5
.~.~.~ Tone sequence

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

31.1  DF  SYSTEM WITH RECEIVER SELECTION {4}
38.1  DF  .~ Coded sequence {1}
38.2  DF  .~.~ With actuation (e.g., turn on/off or alarm indication, etc.) {3}
38.5.~.~.~ Tone sequence

DEFINITION

Classification: 455/38.5

Tone sequence:

(under subclass 38.2) Subject matter including a series of encoded pulses of audio frequencies