US PATENT SUBCLASS 137 / 397
.~.~.~ By float

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

386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
395  DF  .~ Control of outflow from tank {2}
396  DF  .~.~ Self-emptying tanks {1}
397.~.~.~ By float

DEFINITION

Classification: 137/397

(under subclass 396) Apparatus in which the means sensing the liquid level floats in the liquid and is buoyed up thereby.

SEE OR SEARCH THIS CLASS, SUBCLASS:

398+, for float control of the outlet to an accumulation of liquid in tanks which are not self-emptying.

409, for float control of valves not necessarily outlet valves, and see the search notes thereto.