US PATENT SUBCLASS 315 / 94
WITH CATHODE OR CATHODE HEATER SUPPLY CIRCUIT

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


315 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS

94WITH CATHODE OR CATHODE HEATER SUPPLY CIRCUIT {6}
95  DF  .~> Plural load device systems {2}
98  DF  .~> Plural cathodes or heaters in the load device {1}
101  DF  .~> Discharge device and/or rectifier in the cathode or heater circuit
102  DF  .~> Delayed application of the discharge potential {2}
105  DF  .~> Pulsating or A.C. supply to the cathode or heater circuit {1}
107  DF  .~> Automatic cut-out or voltage regulator in the cathode or heater circuit

DEFINITION

Classification: 315/94

(under the class definition) Systems having a load device connected in the system, the load device being a discharge device provided with (1) a thermionic cathode adapted to be heated by electric current other than the discharge current flowing through the cathode, or (2) a cathode of the indirectly heated type, that is, a thermionic cathode which is heated by the heat generated in an electric heater element adjacent the cathode, the system being provided with electric circuit means to apply electric current to the cathode or the cathode heater element.

(1) Note. The subclass does not include patents wherein the claims merely state that the load device in the system is provided with a heated thermionic cathode or an indirectly heated cathode and no significant features of the cathode or heating circuit supply are claimed. Such patents are in the other appropriate subclasses of the class.

(2) Note. This and the indented subclasses are not restricted to gas or vapor discharge devices or lamps as the load devices, but include all discharge device systems

wherein the discharge device includes a thermionic cathode adapted to be heated by electric current other than the discharge current, or an indirectly heated cathode provided with an electric heater element, the system including circuit means to supply current to the cathode or heater element, excepting such systems in which the discharge device load is a discharge control discharge device other than the discontinuous control type gas or vapor discharge device and the system includes means to supply current and/or potential to the discharge control means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

112, for systems in which the load device is provided with means for modifying the temperature of the load device.

SEE OR SEARCH CLASS 313, Electric Lamp and Discharge Devices,

310, and the subclasses specified in the Notes thereto for discharge device structures where the discharge device is provided with an indirectly heated cathode or a resistance heated cathode.

323, Electricity: Power Supply or Regulation Systems,

227, and 291, for systems for controlling the current and/or voltage magnitude by means of an electronic tube wherein the control of the electronic tube is by cathode element control. A usual cathode element control is cathode temperature control.

329, Demodulators, appropriate subclasses for demodulators with significant power supply circuitry.

330, Amplifiers,

113, for amplifier systems including those with polyphase power supplies which may supply the tube heaters; subclass 115 for amplifiers including unrectified a.c. supply to vacuum tube filamentary cathodes; subclass 127 for vacuum tube amplifier systems including those having means to control the power supply of a filamentary cathode or cathode heater; subclasses 201, 205, and 206 for vacuum tube amplifiers including power supply to filamentary cathodes.

363, Electric Power Conversion Systems,

113, for electronic tube current conversion systems wherein the control of the electronic tube convertor is by cathode element control. A usual cathode element control is cathode temperature control.