US PATENT SUBCLASS 327 / 506
.~ Three or more electrode 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}
506.~ Three or more electrode electron tube

DEFINITION

Classification: 327/506

Three or more electrode electron tube:

(under subclass 365) Subject matter including a vacuum or gas filled tube having three or more electrodes in which electrical currents flow between spaced electrodes and in which the conduction of charged particles (e.g., electrons), takes place between the electrodes.