US PATENT SUBCLASS 313 / 131 R
.~.~ Non-shortest line spark and surface spark type

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

118  DF  SPARK PLUGS {22}
130  DF  .~ Non-conducting material in or adjacent gap (e.g., restricts spark) {1}
131 R.~.~ Non-shortest line spark and surface spark type {1}
131 A  DF  .~.~.~> Spark plugs with semiconductive material at the gap

Unofficial Alpha Subclasses: R A

DEFINITION

Classification: 313/131

(under subclass 130) Subject matter in which the material is so situated that the spark is caused to follow the surface of the insulator or to follow a path which is not the shortest path between electrodes.

(1) Note. For example, the insulating material may form a barrier between the sparking electrodes so that the spark must jump the barrier.