(under subclass 293) Discharge devices which have a foraminous or grid-like electrode interposed in the inter-electrode space and spaced form one of the other electrodes so that different parts of the foraminous or grid-like electrode are at different distances from such other electrode.
(1) Note. The foraminous or grid electrode may be uniformly spaced from one of the other electrodes, the second of the other electrodes begin nonuniformly spaced from the foraminous or grid electrode and from the other electrode. This subclass includes discharge devices where the foraminous
or grid electrode is eccentrically spaced in the space between the cathode and anode, and discharge devices where the foraminous or grid-like electrode is spaced in parallel relationship with the cathode and anode but has a different cross-section configuration from that of the cathode or anode (e.g., where the anode is circular and concentric with the cathode, the grid electrode being oval in cross-section).
(2) Note. Some of the devices in this subclass are intended to be used as variable-mu discharge devices.
SEE OR SEARCH THIS CLASS, SUBCLASS:
349, for structure of foraminous and grid-like electrodes where the electrode wall surface which is provided with the openings does not form a straight hollow sleeve and is of a nonstraight surface configuration with the openings in the electrode lying in at least two different planes, and for the structure of foraminous and grid-like electrodes having the wall surface of the electrode which contains the openings in the form of a hollow sleeve, the sleeve having a cross-sectional area at one region of the electrode, which is different from the cross-sectional area at another region of the electrode, such as electrodes which are in the form of a truncated cone, sphere, or which are barrel shaped or hour-glass shaped.
