(under the class definition) Discharge devices which include an envelope and which have at least one electrode of the device exterior to the space enclosed by the envelope.
(1) Note. Some of the discharge devices in this subclass have one or more electrodes within the envelope and another electrode exterior to the envelope. For example, the discharge device may have a cathode and an anode within the envelope, and a control electrode exterior to the envelope.
(2) Note. This subclass does not include devices under the class definition which have an envelope formed in whole or part of metal or other conductive material and being designed for use as an electrode. For such devices, see the subclasses referred to under "SEARCH THIS CLASS, SUBCLASS" below.
SEE OR SEARCH THIS CLASS, SUBCLASS:
166, where the discharge device is provided with a liquid (e.g., mercury) electrode.
246+, for discharge devices which include an envelope, a part of the envelope being formed of metal or conductive material which is designed for use as an electrode, the device including means for supporting and/or spacing a plurality of electrodes in the envelope. 607, where the envelope contains a gas or vapor (i.e., gas or vapor type discharge devices).
SEE OR SEARCH CLASS
329, Demodulators, appropriate subclasses and particularly
368, for an amplitude modulation demodulator utilizing an electron discharge device which may include an exterior electrode.
