US PATENT SUBCLASS 137 / 413
.~.~.~ Fluid pressure

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

386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
409  DF  .~ By float controlled valve {11}
412  DF  .~.~ Servo relay operation of control {1}
413.~.~.~ Fluid pressure {2}
414  DF  .~.~.~.~> Flexible diaphragm valve
415  DF  .~.~.~.~> From tank

DEFINITION

Classification: 137/413

(under subclass 412) Apparatus in which the float controls the application of fluid pressure for operating the flow control means.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type, appropriate subclasses for fluid servo-motors.

251, Valves and Valve Actuation,

25+, for fluid pressure servo valve actuation which are operated by external means or in which the operating means is not specifically claimed, and see the search notes to subclass 25.