US PATENT SUBCLASS 137 / 132
.~ Periodic or accumulation responsive discharge

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

123  DF  SIPHONS {8}
132.~ Periodic or accumulation responsive discharge {4}
133  DF  .~.~> With manual control
134  DF  .~.~> Control by filling auxiliary tank
135  DF  .~.~> Float-operated inlet to siphon
136  DF  .~.~> Release of trapped air {2}

DEFINITION

Classification: 137/132

(under subclass 123) Apparatus having means responsive to a condition or characteristic of the fluid in the system whereby the siphon is caused to discharge at recurrent intervals, i.e., as often as a certain level of tank contents is reached.

SEE OR SEARCH THIS CLASS, SUBCLASS:

130+, for apparatus in which siphon discharge is controlled by a condition in a receptacle into which the siphon discharges.

396+, for self-emptying tanks of other types which empty in response to liquid level as often as filled, and see the search notes to subclass 396.

SEE OR SEARCH CLASS

73, Measuring and Testing, 222, and 226 for tank type meters with siphon discharge.