US PATENT SUBCLASS 313 / 618
.~ Having hollow cathode

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

567  DF  WITH GAS OR VAPOR {24}
618.~ Having hollow cathode

DEFINITION

Classification: 313/618

Having hollow cathode:

(under subclass 567) Subject matter wherein the electrode is

a cathode which has at least a portion which is a cavity or is a hollow cylinder.

(1) Note. Crater type glow discharge lamp sources are here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

615, for a gas or vapor device with a shield between the hollow cathode and the anode.

631+, for a gas or vapor discharge device having a hollow or tubular electrode.