US PATENT SUBCLASS 327 / 550
.~.~ With particular filament heating circuit

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

524  DF  SPECIFIC IDENTIFIABLE DEVICE, CIRCUIT, OR SYSTEM {22}
530  DF  .~ With specific source of supply or bias voltage {9}
550.~.~ With particular filament heating circuit

DEFINITION

Classification: 327/550

With particular filament heating circuit:

(under subclass 530) Subject matter wherein a filament heating circuit with specific structure provides a current to heat the filament of an electron space discharge tube.

SEE OR SEARCH CLASS

315, Electric Lamp and Discharge Devices: Systems,

94+, for cathode or cathode heater supply circuits.

330, Amplifiers,

199+, especially subclass 206 for filamentary heating of the filaments of an amplifier.