US PATENT SUBCLASS 137 / 409
.~ By float controlled valve

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

386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
409.~ By float controlled valve {11}
410  DF  .~.~> Valve opened by external means, closing or closing control by float
411  DF  .~.~> Single float controls plural valves
412  DF  .~.~> Servo relay operation of control {1}
416  DF  .~.~> Quick acting {4}
423  DF  .~.~> Plural floats
424  DF  .~.~> With counter-balance {1}
426  DF  .~.~> Level adjustment or selection means
427  DF  .~.~> With float leakage disposal
428  DF  .~.~> In separate communicating float chamber
429  DF  .~.~> Rectilinearly traveling float {1}
434  DF  .~.~> Float arm operated valve {14}

DEFINITION

Classification: 137/409

(under subclass 386) Apparatus wherein the element which senses the liquid level floats on the liquid and is buoyed up thereby.

SEE OR SEARCH THIS CLASS, SUBCLASS:

41, for float controlled marine governors.

131, for siphon discharge receiver with float control for siphon.

135, for float operated inlets to siphons.

137, for float operated vents in periodic siphons.

165+, 192+ and 202, for float controlled traps and valves in diverse fluid containing pressure systems. 247.21, for a ball-type float in combination with a liquid seal means.

397, for float control in self emptying tanks.

398+, for control of the outflow from the liquid accumulation in response to a float.

404, for bucket type floats, and see the search notes thereto.

SEE OR SEARCH CLASS

4, Baths, Closets, Sinks, and Spittoons, appropriate subclasses for float operated devices of that class.

73, Measuring and Testing,

322.5, for floats, per se.

166, Wells,

54, for automatically operated well apparatus comprising float controlled valves.

222, Dispensing, 62, 66 and 67+ for float controlled dispensers.

417, Pumps,

40+, for a float which senses liquid accumulation to control a drive motor.