US PATENT SUBCLASS 332 / 137
.~ Including electron discharge device

Current as of: June, 1999
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332 /   HD   MODULATORS

117  DF  FREQUENCY MODULATOR {6}
137.~ Including electron discharge device {1}
138  DF  .~.~> Particular oscillator circuit {2}

DEFINITION

Classification: 332/137

Including electron discharge device:

(under subclass 117) Subject matter utilizing a device which has electrical current flow between two spaced electrodes in a gas, vapor or vacuum.

(1) Note. This might include, for example, vacuum or gas tubes such as diodes, triodes or pentodes.

(2) Note. Additional control electrodes may be present.