US PATENT SUBCLASS 327 / 289
.~.~.~ Electron tube

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

100  DF  SIGNAL CONVERTING, SHAPING, OR GENERATING {29}
261  DF  .~ Having specific delay in producing output waveform {7}
285  DF  .~.~ Having specific active circuit element or structure (e.g., complementary transistors, etc.) {4}
289.~.~.~ Electron tube

DEFINITION

Classification: 327/289

Electron tube:

(under subclass 285) Subject matter including a gas filled or partially or fully evacuated (vacuum) device which regulates current flow between spaced electrodes.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks,

138+, for passive delay networks.