US PATENT SUBCLASS 137 / 479
.~ Combustion engine induction type

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
479.~ Combustion engine induction type {5}
480  DF  .~.~> Valve in auxiliary inlet to induction line
481  DF  .~.~> With manual modifier
482  DF  .~.~> With suction compensator
483  DF  .~.~> With separate reactor surface
484  DF  .~.~> Unbalanced pivoted valve (e.g., unbalanced butterfly type)

DEFINITION

Classification: 137/479

(under subclass 455) Apparatus comprising governor valves or

induction controlled inlets associated with internal combustion engines, in which a valve responds to a pressure differential proportional to changes to an outlet at sub-atmospheric pressure, i.e., the induction manifold of the engine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494+, for reactor surface controlled valves of this type controlled by super-atmospheric pressure rather than sub-atmospheric pressure.

511+, for condition responsive valves of the direct response type, especially subclasses 517+ for direct response valves which are biased open and subclass 526 for vacuum relief type, and see the search notes to subclass 517.