US PATENT SUBCLASS 137 / 189
.~.~.~.~.~.~ Gravitating vessel

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

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
171  DF  .~ Fluid separating traps or vents {5}
177  DF  .~.~ Discriminating outlet for liquid {4}
183  DF  .~.~.~ With fluid responsive valve {3}
187  DF  .~.~.~.~ Level responsive {2}
188  DF  .~.~.~.~.~ Weight or pressure {1}
189.~.~.~.~.~.~ Gravitating vessel {1}
190  DF  .~.~.~.~.~.~.~> Sinking or bucket type float {1}

DEFINITION

Classification: 137/189

(under subclass 188) Separating traps wherein liquid accumulates in a vessel which lowers in response to the weight of the liquid which lowering controls the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

161, and 162+, for similar subject matter with a control for applying gas pressure to the trap to force the discharge thereof as to a boiler.

408, for gravitating tank devices responsive to and controlling liquid level, and see the search notes thereto.