US PATENT SUBCLASS 137 / 120
.~.~.~.~ Control by filling auxiliary gravitating or float operating tank

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
109  DF  .~ Self-controlled branched flow systems {4}
118.01  DF  .~.~ Plural outflows {5}
119.01  DF  .~.~.~ Alternately or successively substituted outflow {7}
120.~.~.~.~ Control by filling auxiliary gravitating or float operating tank

DEFINITION

Classification: 137/120

(under subclass 119) Systems in which the control of the flow is in response to a filling of a separate or auxiliary tank of the gravitating or float operating type.

(1) Note. Many of the patents in this subclass are drawn to rain spouts in which the initial flow is wasted to remove dirt before the rain water is fed to the cistern or storage vessel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

386+, for other liquid level responsive flow control, especially subclass 408 for gravitating tank devices and subclasses 409+ for float operated valves, and see the search notes to subclasses 386, 403, 408, and 409.