.~ Plural parallel gaps (e.g., main and standby, serrated electrode)
DEFINITION
Classification: 313/140
(under subclass 118) Subject matter having means to define plural distinct ignition spark gap spaces which are
electrically connected in parallel.
(1) Note. This subclass includes, for example, spark plugs having a plurality of separate center electrodes which are connected in parallel and which all cooperate with one or more other electrodes to define parallel gaps, spark gaps having a multipointed electrode cooperating with another electrode so that each point of the electrode defines a sparking electrode with the other electrode, and spark plugs having a plurality of shell electrodes which cooperate with the same center electrode.
(2) Note. Some of the spark plugs in this subclass are intended to make the plug efficient over a longer period of time by having the spark shift to another electrode or place on the electrode as the spark gap space widens due to the "pitting" or wearing action of the spark.
(3) Note. This subclass does not include spark plugs having two electrodes formed of smooth wires or rods which are mounted in parallel or convergent relation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
123+, for spark plugs having plural ignition spark gaps which are electrically connected in series. 236, for space discharge devices having a stand-by or spare electrode.
306+, for other space discharge devices having three or more distinct electrodes.
309, for other space discharge devices having a multipointed or serrated edge electrode, and subclass 351 for the electrodes, per se.
