US PATENT SUBCLASS 324 / 397
.~.~ By shorting the plug to ground to indicate 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}
397.~.~ By shorting the plug to ground to indicate spark plug condition {1}
398  DF  .~.~.~> With air gap in ground circuit

DEFINITION

Classification: 324/397

By shorting the plug to ground to indicate spark plug condition:

(under subclass 393) Subject matter wherein the test to indicate the condition of a spark plug consists of shorting the plug to ground and observing the change in the speed of the engine.