US PATENT SUBCLASS 327 / 414
.~.~ Electron tube

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

365  DF  GATING (I.E., SWITCHING INPUT TO OUTPUT) {12}
407  DF  .~ Converging with plural inputs and single output {3}
414.~.~ Electron tube

DEFINITION

Classification: 327/414

Electron tube:

(under subclass 407) Subject matter wherein at least one path includes a vacuum tube or a gas filled device, in which electrical currents flow between spaced electrodes and in which the conduction of charged particles (e.g., electrons) takes place between electrodes.