US PATENT SUBCLASS 313 / 349
.~.~ Nonuniform mesh area or nonstraight electrodes or nonuniform cross sectional area electrodes

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

326  DF  ELECTRODE AND SHIELD STRUCTURES {14}
348  DF  .~ Foraminous electrodes (e.g., grids) or shields {2}
349.~.~ Nonuniform mesh area or nonstraight electrodes or nonuniform cross sectional area electrodes

DEFINITION

Classification: 313/349

(under subclass 348) Electrodes and shields, (1) having the ratio of area of free passage through the openings in the electrode or shield to the obturating area of the electrode or shield in one region of the electrode or shield different from such ratio in another region of the electrode or shield, (2) where the electrode or shield wall surface is not a cylindrical hollow sleeve and is of a nonstraight surface configuration with the foraminous wall of the electrode or shield lying in at least two different planes, or (3) having the foraminous wall surface of the electrode or shield in the form of a hollow sleeve, the sleeve having the cross-sectional area at one region of the electrode or shield different from the cross-sectional area at another region of the electrode or shield.

(1) Note. Under (1) in the subclass definition is included electrodes and shields having at least one opening in the electrode or shield of a different area from the area of another of the openings, or electrodes and shields having the openings in the electrode or shield nonuniformly spaced with respect to each other, or electrodes and shields formed of a wire coil or helix which has a nonuniform pitch for the turns of the coil or helix. Under (3) in the subclass definition is included electrodes and shields the wall surface of which is conical, in the form of a truncated cone, barrel-shape or spherical.

(2) Note. Many of the electrodes in this subclass are intended for use as discharge control electrodes in discharge devices of the variable-mu type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

294, for discharge devices having a foraminous or grid electrode interposed in the discharge space between two other electrodes, the foraminous or grid electrode being nonuniformly spaced from the other electrodes (e.g., the foraminous or grid electrode being eccentrically mounted, or being noncylindrical with respect to concentric electrodes, etc..).

295, for discharge devices having a foraminous or grid electrode interposed in the discharge space between two other electrodes, the foraminous or grid electrode having a nonuniform mesh area. 348, and 350, for foraminous or open-work electrodes and shields where the wall surface is a straight hollow sleeve and is uniformly foraminous over its surface.