US PATENT SUBCLASS 315 / 46
.~ Filament, electric heater, or resistance in shunt with the discharge electrodes of a discharge device load

Current as of: June, 1999
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315 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS

32  DF  COMBINED LOAD DEVICE OR LOAD DEVICE TEMPERATURE MODIFYING MEANS AND ELECTRICAL CIRCUIT DEVICE STRUCTURE {19}
46.~ Filament, electric heater, or resistance in shunt with the discharge electrodes of a discharge device load {2}
47  DF  .~.~> Automatic switch in the shunt circuit
48  DF  .~.~> Cathode or cathode heater in the shunt circuit

DEFINITION

Classification: 315/46

(under subclass 32) Subject matter, wherein the load device is a discharge device having structurally combined therewith a filament, or an electric resistance heater element, or a resistance, the filament, heater or resistance being electrically connected in shunt with the discharge electrodes of the discharge device.

(1) Note. The filament or electric heater may be the cathode element or the cathode heater element of the discharge device.

(2) Note. In some of the devices in this subclass the filament is designed to emit light either while the discharge device is operating or before the electric discharge is initiated between the discharge electrodes. This subclass includes therefore combined discharge lamps and incandescent lamps where the lamp filament is connected in shunt to the discharge electrodes. In some of the devices in this subclass, the filament or heater merely vaporizes material and/or acts as an auxiliary cathode until the principal discharge can be established.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49, for discharge devices having a filament or electric heater connected in electrical series with the discharge device load.

94, and indented subclasses, for systems under the class definition wherein a discharge device load is provided with a cathode made of resistance material, or having the cathode heated by an electrical resistance heater, and the system includes means to supply electric current to the cathode or heater.

115, and indented subclass, for systems under the class definition wherein the load device is provided with an electric heater for heating the load device and the system includes means to supply electric current to the heater.

182, for miscellaneous systems under the class definition which include a discharge device load and another diverse type load device.

SEE OR SEARCH CLASS

313, Electric Lamp and Discharge Devices,

1+, for the structural combination of a discharge device and an incandescent lamp which are combined so as to form a unitary device where the incandescent lamp filament is not connected either in shunt or in series with the discharge electrodes, subclasses 15+ for discharge devices which are provided with an electric resistance heater for the discharge device which is not connected either in shunt or in series with the discharge electrodes, and subclass 310 and the subclasses specified in the Notes thereto for discharge devices having an indirectly heated cathode, the cathode heater element not being connected either in shunt or in series with the discharge electrodes.