US PATENT SUBCLASS 324 / 393
.~ In situ testing of spark plug

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.~ In situ testing of spark plug {5}
394  DF  .~.~> With cathode-ray tube display
395  DF  .~.~> Using an illuminating device to indicate spark plug condition
396  DF  .~.~> With an air gap in series with spark plug to indicate spark plug condition
397  DF  .~.~> By shorting the plug to ground to indicate spark plug condition {1}
399  DF  .~.~> Wherein a measured electric quantity indicates spark plug condition

DEFINITION

Classification: 324/393

In situ testing of spark plug:

(under subclass 378) Subject matter wherein the spark plug is tested while in the engine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

403+, for testing of discharge characteristics of space discharge devices including spark plugs.