US PATENT SUBCLASS 313 / 38
.~.~ Hollow shield around filament or cathode

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

11  DF  WITH TEMPERATURE MODIFIER {19}
37  DF  .~ For filament or heated cathode {1}
38.~.~ Hollow shield around filament or cathode

DEFINITION

Classification: 313/38

(under subclass 37) Devices in which the temperature modifying means is a hollow shield which surrounds at least a portion of the filament or heated cathode.