US PATENT SUBCLASS 137 / 161
.~.~.~.~ Gravitating

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

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
156  DF  .~ Gas pressure discharge of liquids feed traps (e.g., to boiler) {3}
159  DF  .~.~ Gas pressure controlled by amount of liquid in trap {3}
160  DF  .~.~.~ Plural trap chambers {1}
161.~.~.~.~ Gravitating

DEFINITION

Classification: 137/161

(under subclass 160) Feed-traps wherein alternately acting feed traps are moved by gravity to discharge their contents and the lowering of one trap raises the other trap.

SEE OR SEARCH THIS CLASS, SUBCLASS:

403+, for liquid level responsive or maintaining control systems operated by the weight of accumulated fluid, especially subclass 408 for accumulation in the gravitating tank, and see the search notes to subclasses 403 and 408.

SEE OR SEARCH CLASS

177, Weighing Scales,

90, for weighing apparatus in which alternating weight chambers control flow of the material being weighed.