US PATENT SUBCLASS 123 / 406.67
.~ Vacuum timing control

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

406.11  DF  SPARK IGNITION TIMING CONTROL {5}
406.67.~ Vacuum timing control {5}
406.68  DF  .~.~> Barometric pressure responsive
406.69  DF  .~.~> Condition responsive valve in fluid path from vacuum source {1}
406.71  DF  .~.~> Fluid delay between vacuum source and actuator (e.g., fixed restriction)
406.72  DF  .~.~> Increasing vacuum retards spark timing
406.73  DF  .~.~> Plural diaphragms or actuators

DEFINITION

Classification: 123/406.67

Vacuum timing control:

(under subclass 406.11) Subject matter wherein the regulating means for varying spark ignition timing includes an actuation device which has an enclosed space from which a gas (e.g., intake air) has been partially removed so that the gas remaining in the space exerts less pressure than the atmosphere.