US PATENT SUBCLASS 137 / 386
LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS

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

386LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
387  DF  .~> Washing machine cycle control
388  DF  .~> Liquid excluding devices for gas inlet or outlets
389  DF  .~> With second diverse control {1}
391  DF  .~> Control of both inflow and outflow of tank
392  DF  .~> Electrical characteristic sensing
393  DF  .~> With control fluid connection at desired liquid level
395  DF  .~> Control of outflow from tank {2}
400  DF  .~> With supplemental or safety closing means or bias {2}
403  DF  .~> By weight of accumulated fluid {4}
409  DF  .~> By float controlled valve {11}
453  DF  .~> Barometric {1}

DEFINITION

Classification: 137/386

(under the class definition) Apparatus which includes an element which senses the level of a liquid in means to receive an accumulation thereof and in response thereto exercises a control of the flow of fluid or acts to maintain that level of the liquid.

(1) Note. Apparatus which maintains the liquid level by means of overflow pipes or arrangements only is excluded from this and indented subclasses, since there is not change in the operation or relative position of any of the parts of the system which is caused by or related to the maintenance of or failure to maintain the level.

(2) Note. Valve actuating means operated by diverting a part of the flow into a metering device have been classified as valve actuators, even though the metering device is a level responsive type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

101.25+, for a self-proportioning system with liquid level sensing.

132+, for periodic siphons, i.e., those which discharge as often as a certain level is reached in the supply container or receiver. 154+, for pressure systems containing diverse fluids which include a control of fluid in response to a liquid level, especially subclasses 197+ for the hygroscopic type of discriminating outlet for gas.

213+, for diverse fluid containing pressure systems having level responsive gas vents or whistles.

262, for flow dividing compartments, the outlet from one of which may be a level maintaining overflow.

561+, for apparatus which maintains a desired level in a container by a continuous over-supply, especially subclasses 563+ for such systems which return the overflow to the supply and 577+ for tanks with movable or adjustable overflow including float supported tank outlets in subclass 578. See (1) Note.

624.14, for repeating cycle valves actuated by line fluid only.

SEE OR SEARCH CLASS

62, Refrigeration,

188, and 218+ for refrigeration means having liquid level control.

222, Dispensing,

52+, for automatic dispensers, especially subclass 62 for those having a float controlled pressure liquid and subclasses 64+ for material level control.

251, Valves and Valve Actuation, 12+, for valves actuated by flow metering arrangements, and subclasses 15+ for valves having compulsory cutoff after a flow period. See (2) Note, above.

399, Electrophotography,

237+, for liquid developer applied to a latent image within an electrophotos:graphic device.

417, Pumps,

36+, for control of a pump drive motor in response to liquid accumulation of pump fluid.