(under subclass 306) Discharge devices which have four or more electrodes.
(1) Note. In some of the discharge devices in this subclass, one or more of the electrodes are intended to be used merely as discharge control electrodes.
(2) Note. This is a residual subclass and provides only for discharge devices having four or more electrodes which are not provided for in the subclasses above. 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 four or more electrodes are classified in subclasses 103+ above and not cross-referenced to this subclass. 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:
1+, for plural unit discharge devices which have at least two cathodes and an anode for each cathode.
103+, and the subclasses specified in the notes thereto, for discharge devices of the secondary emitter type (e.g., electron multiplier) which have four or more electrodes.
238+, for discharge devices which include supporting and/or spacing structure for three or more electrodes. If structure in addition to the electrode supporting and/or spacing structure is disclosed or is claimed, the patent is cross-referenced to this subclass where the discharge device has four or more electrodes if it is not specifically provided for in a subclass other than subclasses 238+ which precedes this subclass. 293, for discharge devices which have an apertured or
grid-like electrode interposed in the discharge space between a cathode and another electrode (e.g., anode), a fourth electrode being located outside of the discharge space (e.g., a shield grid around a cylindrical anode).
296+, for discharge devices which have four or more electrodes, at least two of the electrodes being apertured or grid-like electrodes which are interposed in the inter-electrode space defined by other electrodes.
364+, for cathode-ray tube having four or more electrodes.
581, where the discharge device has an envelope which contains a gas or vapor.
SEE OR SEARCH CLASS
314, Electric Lamp and Discharge Devices: Consumable Electrodes,
7, for consumable electrode discharge devices (e.g., arc lamps and similar devices having means to feed the electrodes together as they are consumed) where the structure includes at least two cathodes each having a separate anode; subclass 33 where the consumable electrode discharge device is provided with four or more series connected electrodes and subclasses 36+ where the consumable electrode discharge device has a plurality of cathodes or a plurality of anodes and has four or more electrodes.
315, Electric Lamp and Discharge Devices: Systems,
34, 63 for discharge devices which have four or more electrodes and which have structurally combined therewith a circuit element such as an electric switch or an impedance.
