US PATENT SUBCLASS 455 / 293
.~.~.~ Specified stage (e.g., mixer, amplifier, or demodulator)

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
269  DF  .~ With wave collector (e.g., antenna) {4}
280  DF  .~.~ With coupling to a stage of the receiver {7}
293.~.~.~ Specified stage (e.g., mixer, amplifier, or demodulator) {1}
294  DF  .~.~.~.~> With particular electron tube structure

DEFINITION

Classification: 455/293

Specified stage (e.g., mixer, amplifier, or demodulator):

(under subclass 280) Subject matter wherein the coupling means is connected to at least a named stage of the receiver.