US PATENT SUBCLASS 313 / 342
.~.~ Noninductive

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

326  DF  ELECTRODE AND SHIELD STRUCTURES {14}
341  DF  .~ Filament or resistance heated electrodes {4}
342.~.~ Noninductive

DEFINITION

Classification: 313/342

(under subclass 341) Filaments and electrodes where the parts of the filament and electrodes are arranged so as to reduce to a minimum the electromagnetic or electrostatic field which is generated by the current flowing through the filament or electrode.

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337+, for indirectly heated cathodes which are provided with means to shield the electrons emitted by the cathode from the electromagnetic or electrostatic field generated by the heating means.

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174, Electricity: Conductors and Insulators,

32+, for conductors of the noninductive type.