US PATENT SUBCLASS 313 / 158
.~.~.~ Pole pieces facing electrode ends

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

153  DF  WITH MAGNETIC DEVICE {4}
156  DF  .~ Field transverse to discharge {1}
157  DF  .~.~ Concentrically arranged electrode with axial field {1}
158.~.~.~ Pole pieces facing electrode ends {1}
159  DF  .~.~.~.~> Electrode support penetrates pole piece

DEFINITION

Classification: 313/158

(under subclass 157) Subject matter in which the magnetic means includes magnetic poles which extend across and face

the ends of the concentrically arranged elongated electrodes and are axially spaced from the electrodes.

(1) Note. The magnetic pole piece faces are usually planar and mutually parallel.