US PATENT SUBCLASS 455 / 321
.~.~.~ In a single envelope or with common active element (e.g., autodyne)

Current as of: June, 1999
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130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
313  DF  .~ Frequency modifying or conversion {4}
318  DF  .~.~ With specified local oscillator structure or coupling {2}
321.~.~.~ In a single envelope or with common active element (e.g., autodyne) {1}
322  DF  .~.~.~.~> Plural common electrode

DEFINITION

Classification: 455/321

In a single envelope or with common active element (e.g., autodyne):

(under subclass 318) Subject matter wherein the frequency modifying or conversion means and the local oscillator means are enclosed in a single envelope.

(1) Note. The combination of means may comprise: (a) a single triode or diode type tube structure with external circuitry whereby a local signal is generated and superposed on a modulated signal input, (b) two or more assemblies of electrodes to which the local signal and the modulated input signal are applied, (c) a single assembly of electrodes to some of which the local signal is applied and to others of which the modulated wave input is applied. One example of the subject matter to be found here is the autodyne system in which the same electron tube device constitutes both an oscillator and a mixer (1st detector).

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

591, for miscellaneous circuits where an electron tube performs plural functions.

329, Demodulators,

323+, 346 and 358+ for diverse types of demodulators using locally generated oscillations. 331, Oscillators,

58, for oscillators performing plural functions simultaneously.