(under subclass 326) Electrodes which are constructed so that at least a small area of the electrode becomes incandescent when bombarded by electrons.
(1) Note. This subclass is limited to electrodes which are especially designed to have a portion of the electrode become incandescent when bombarded by electrons and does not include electrodes, such as anodes, which may become heated only as an undesired incident of their operation.
(2) Note. Some of the electrodes in this subclass are intended for use as targets in cathode-ray tubes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
346, for electrodes containing and/or coated with electron emissive material designed for use in discharge devices, usually of the type containing a gas or vapor, and which are designed to become heated by the bombardment of the electric space discharge so that they become thermionic electrodes.
305, for miscellaneous discharge devices which have an anode which is designed to be heated by the space discharge. Included in subclass 305 are discharge devices where the heated anode has a surface designed to emit electrons to a second anode (an electrode other than the cathode which emits electrons to the heated anode).
464, for cathode ray devices provided with targets adapted to be rendered incandescent by the cathode beam.
627+, for discharge devices of the gas or vapor type having a thermionic cathode which is heated by the space discharge. Also 627+, for discharge devices of the gas or vapor type having an anode which is heated to incandescence by the space discharge.
SEE OR SEARCH CLASS
378, X-Ray or Gamma Ray Systems or Devices, for X-ray tube targets or anticathodes.
