US PATENT SUBCLASS 324 / 399
.~.~ Wherein a measured electric quantity indicates spark plug condition

Current as of: June, 1999
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324 /   HD   ELECTRICITY: MEASURING AND TESTING

378  DF  INTERNAL-COMBUSTION ENGINE IGNITION SYSTEM OR DEVICE {12}
393  DF  .~ In situ testing of spark plug {5}
399.~.~ Wherein a measured electric quantity indicates spark plug condition

DEFINITION

Classification: 324/399

Wherein a measured electric quantity indicates spark plug condition:

(under subclass 393) Subject matter wherein an electric characteristic (e.g., current, voltage, resistance, etc.) is evaluated or measured to indicate whether or not a spark plug is operating properly.