US PATENT SUBCLASS 137 / 123
SIPHONS

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

123SIPHONS {8}
124  DF  .~> Plural {3}
130  DF  .~> With discharge-controlling receiver {1}
132  DF  .~> Periodic or accumulation responsive discharge {4}
140  DF  .~> With strainer, filter, separator or sediment trap
141  DF  .~> With recorder, register, signal, indicator or inspection window
142  DF  .~> With flow starting, stopping or maintaining means {7}
152  DF  .~> With means for mounting and/or positioning relative to siphon chamber
153  DF  .~> Elements

DEFINITION

Classification: 137/123

(under the class definition) Apparatus having a flow passage comprising two branches or legs of unequal effective length by which a liquid can be transferred to a lower level over an intermediate elevation by the pressure of the atmosphere in forcing the liquid up the shorter branch or leg immersed in it while the excess of weight of the liquid in the longer branch (when once filled) causes a continuous flow.

(1) Note. This group of subclasses is directed to the siphon subcombination, i.e., the siphon element, per se, and this element associated with supply and/or receiver chambers and/or such other adjuncts as are commonly found in this class combined with the basic subject matter of the class. Patents for combinations of siphons with other art devices are classified with the art device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

591, for tanks with internally extending inverted U passage, which are not intended to operate as siphons even though of the proper design for it.

SEE OR SEARCH CLASS

4, Baths, Closets, Sinks, and Spittoons,

368+, for water closet flushing tanks having an outlet siphon and subclasses 421+ for siphon bowls. 141, Fluent Material Handling, With Receiver or Receiver Coacting Means,

230, for siphon tube filling of separable receivers, and see the search notes thereto.

222, Dispensing,

204, for dispenser type siphons with external starting means and subclass 416 for dispensing siphons, per se.

399, Electrophotography,

237+, for liquid developer applied to a latent image within

an electrophotos:graphic device.