US PATENT SUBCLASS 455 / 229
.~.~ Responsive to carrier absence or presence

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
227  DF  .~ Responsive to an input signal of particular predetermined frequency {2}
229.~.~ Responsive to carrier absence or presence

DEFINITION

Classification: 455/229

Responsive to carrier absence or presence:

(under subclass 227) Subject matter including means for indicating the absence or presence of the carrier in a receiver.

(1) Note. The responsive means may energize an alarm or two-state device.

(2) Note. Systems for indicating carrier level or strength, or for indicating tuning, are classified in subclass 154.