US PATENT SUBCLASS 381 / 167
.~.~ Ionized gap, spark, or flame

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
166  DF  .~ Having a fluid as a conducting element {1}
167.~.~ Ionized gap, spark, or flame

DEFINITION

Classification: 381/167

Ionized gap, spark, or flame:

(under subclass 166) Subject matter which ionizes the air or other gas or causes sparks across a gap.

(1) Note. Included herein are also plasma, glow discharge, or flame.