US PATENT SUBCLASS 313 / 598
.~.~.~.~ Mean free-path spacing

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

567  DF  WITH GAS OR VAPOR {24}
581  DF  .~ Three or more electrode discharge device {9}
595  DF  .~.~ Internal start or control electrode between discharge electrodes {3}
597  DF  .~.~.~ Interposed apertured electrode {2}
598.~.~.~.~ Mean free-path spacing

DEFINITION

Classification: 313/598

Mean free-path spacing:

(under subclass 597) Subject matter wherein the interposed apertured electrode is spaced from another electrode a distance which is less than the mean free path distance of an electron in the gas or vapor within the device.

(1) Note. The mean free path of an electron is the average distance an electron may travel in the gas or vapor without producing ionization of the gas or vapor. As the mean free path distance depends upon a number of factors, not all of which necessarily involve structure of the discharge device, this subclass includes patents which claim two electrodes as being within the mean free path distance and include as cross

references patents which disclose that the electrodes are within the mean free path distance.

(2) Note. The electrodes between which the apertured electrode is interposed may be spaced from each other a distance less than the mean free path length.