US PATENT SUBCLASS 123 / 406.49
.~.~ Barometric pressure responsive

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

406.11  DF  SPARK IGNITION TIMING CONTROL {5}
406.12  DF  .~ Electronic control {10}
406.49.~.~ Barometric pressure responsive

DEFINITION

Classification: 123/406.49

Barometric pressure responsive:

Subject matter under subclass 406.12 wherein the regulating means to vary spark ignition timing is responsive to ambient atmospheric pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

406.68, for a spark ignition timing control utilizing engine vacuum and responsive to barometric pressure.