(under subclass 306) Discharge devices which have a discharge control electrode.
(1) Note. This is the residual subclass providing for discharge devices having three electrodes, one of the electrodes being designated as a control electrode. As pointed out in the glossary, a control electrode is an electrode designed to influence or control the discharge current flowing between other electrodes. Accordingly, whether or not an electrode is a control electrode will depend upon the system which is used with the discharge device. The search should include the subclasses above which provide for special types of discharge devices where a specific type of discharge device is involved. For example, secondary emissive discharge devices (e.g., electron
multipliers) having a control electrode are classified in subclasses 103+ above. Where the control electrode is an apertured or grid-like electrode interposed in the discharge space between two other electrodes, the patent is classified in subclasses 293+ above. Where the discharge device is provided for in some general subclass above, such as subclasses 11+ (with temperature modifier), or subclasses 238+ (with support and/or spacing structure for electrode and/or shield), and is not cross-referenced to a subclass providing for a special type of discharge device, the patent is cross-referenced into this subclass. The notes below refer to some of the subclasses which specifically provide for four or more electrode discharge devices.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5+, for plural unit discharge devices (e.g., discharge devices having at least two cathodes and an anode for each cathode) at least one of the discharge devices having a control electrode.
153+, for discharge devices having a control electrode and also a magnetic device for influencing the space discharge.
166, 167 and 170+, for liquid electrode discharge devices which are provided with a control electrode. See subclass 166 where the control electrode is external of the envelope of the device; 167, where the control electrode is an apertured or grid-like electrode interposed between the cathode and anode and 170+, where the control electrode is an auxiliary starting or holding electrode. 234, where the control electrode is exterior to the envelope of the discharge device.
243+, for discharge devices having significant supporting and/or spacing structure for a plurality of electrodes, one of which is a control electrode. If structure in addition to the electrode supporting and/or spacing structure is disclosed or claimed, the patent is cross-referenced to this subclass where the discharge device has a control electrode unless the device is specifically provided for in a subclass other than subclasses 243+ which precedes this subclass.
293+, where the control electrode is an apertured or grid-like electrode interposed in the discharge space defined by two other electrodes.
307, where the discharge device has four or more electrodes, one of which is a control electrode.
447, and the subclasses specified in the notes thereto for cathode-ray tubes which have a control electrode.
537, for photosensitive discharge devices which have a control electrode.
581, where the discharge device has an envelope containing an atmosphere of gas or vapor and a control electrode.
