US PATENT SUBCLASS 455 / 331
.~.~.~ Crystal or electron tube diode

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
313  DF  .~ Frequency modifying or conversion {4}
323  DF  .~.~ Particular frequency conversion structure or circuitry {5}
331.~.~.~ Crystal or electron tube diode

DEFINITION

Classification: 455/331

Crystal or electron tube diode:

(under subclass 323) Systems and in which the frequency conversion means consists of crystal or other type (e.g., electron tube) diode devices of the two terminal or electrode type. The diodes may be of passive rectifier type or active such as a negative resistance (e.g., tunnel or Esaki diode).

SEE OR SEARCH THIS CLASS, SUBCLASS:

326+, for plural diode mixers forming a balanced mixer combined with distributed parameter structure.

330+, for a diode mixer combined with nonlinear structure.

333, for frequency converters of the semiconductor active element type having three or more terminals.

SEE OR SEARCH CLASS

329, Demodulators and Detectors,

203+, for demodulating devices consisting of diode or two electrode devices. 332, Modulators,

139+, for piezoelectric devices in a frequency modulator, subclass 172 for an amplitude modulator having a bridge which may include a nonlinear device, and subclasses 176+ for a nonlinear device in an amplitude modulator.