US PATENT SUBCLASS 331 / 72
ELECTRON-COUPLED TYPE


Current as of: June, 1999
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331 /   HD   OSCILLATORS

72ELECTRON-COUPLED TYPE {1}
73  DF  .~> Piezoelectric crystal resonator


DEFINITION

Classification: 331/72

(under the class definition) Subject matter wherein the active element of the oscillator includes a cathode, two or more grids and an output electrode (e.g., conventional tetrode or pentode) and wherein the cathode and at least two grids are connected in circuit to form a triode oscillator, one of the grids acting as an anode electrode, and wherein the output electrode is coupled to the oscillator solely through the electron stream, so that the output circuit is substantially isolated from the oscillator circuit. In effect, the resulting circuit comprises an oscillator and power amplifier combined in one tube.

SEE OR SEARCH THIS CLASS, SUBCLASS:

75+, for the combination of oscillator and output amplifier, wherein the oscillator and amplifier each comprise separate and distinct active elements.

79+, for beam tube type oscillators wherein the output circuit may be electron coupled to a directed electron beam.

134, for negative resistance oscillators of the transition type wherein a plural grid active element is utilized.

147, for blocking oscillators utilizing a plural grid tube.

152, for relaxation oscillators having a multi-grid discharge device in the charged capacitor circuit.