(under the class definition) Discharge devices which have an anode or target which is designed to be heated by the electron bombardment form the cathode.
(1) Note. This subclass includes discharge devices of the cathanode type i.e., discharge devices which have an electrode, known as the cathanode, which is the anode with respect to a cathode which bombards it with electrons, the electron bombardment being designed to heat the cathanode to
electron emission temperature so that another surface of the cathanode will emit electrons to a third electrode which serves as the anode for the cathode surface of the cathanode.
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8, for discharge devices which are provided with a separate body which is not intended to be used as an electrode and which is designed to be heated to incandescence by the space discharge.
39+, and 47, for discharge devices which are provided with means for preventing the flow of heat away from an electrode. See subclasses 39+ where the electrode is within an envelope.
103+, and the subclasses specified in the notes thereto for discharge devices having an electrode which emits secondary electrons when bombarded by primary electrons. 337+, for the structure of indirectly heated cathodes, per se.
347, for the structure of electrodes which are designed to be incandescible upon electron bombardment.
464, for cathode-ray tubes having anodes or targets which are designed to be heated to incandescence by the cathode beam.
588, for discharge devices which have an envelope and an atmosphere of gas or vapor, the discharge device having two electrodes between which an ionizing discharge is to be maintained, the ionizing discharge being a source of electrons for a discharge to a third electrode, the discharge to the third electrode being nonionizing (electronic).
627+, for discharge devices which contain a gas or vapor and which have an electrode designed to be used alternately as a cathode and as an anode when the discharge device is used with alternating current, the electrode being designed to be heated to electron emissive temperature by the ionic bombardment. Also, 627+, for discharge devices containing an atmosphere of gas or vapor which have an incandescible anode.
