US PATENT SUBCLASS 313 / 139
.~ Ring or disk electrode (e.g., sector)

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

118  DF  SPARK PLUGS {22}
139.~ Ring or disk electrode (e.g., sector)

DEFINITION

Classification: 313/139

(under subclass 118) Subject matter having an ignition electrode whose shape is that of a ring or disk or a sector of a ring or disk.

SEE OR SEARCH THIS CLASS, SUBCLASS:

133, for this subject matter having a ball shaped electrode.

138, for this subject matter having plural ignition electrodes each of which are pure figures of revolution about the longitudinal axis of the plug, one of the electrodes being a ring or disk.