US PATENT SUBCLASS 123 / 406.69
.~.~ Condition responsive valve in fluid path from vacuum source

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

406.11  DF  SPARK IGNITION TIMING CONTROL {5}
406.67  DF  .~ Vacuum timing control {5}
406.69.~.~ Condition responsive valve in fluid path from vacuum source {1}
406.7  DF  .~.~.~> Temperature responsive

DEFINITION

Classification: 123/406.69

Condition responsive valve in fluid path from vacuum source:

(under subclass 406.67) Subject matter wherein the actuation device includes a means for varying the cross-sectional area of a fluid conducting conduit between the enclosed space and a source of gas at less than atmospheric pressure in response to an operational parameter of the internal combustion engine.