US PATENT SUBCLASS 137 / 139
.~.~.~.~ Auxiliary liquid trap seal

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

123  DF  SIPHONS {8}
132  DF  .~ Periodic or accumulation responsive discharge {4}
136  DF  .~.~ Release of trapped air {2}
138  DF  .~.~.~ Through liquid trap seal {1}
139.~.~.~.~ Auxiliary liquid trap seal

DEFINITION

Classification: 137/139

(under subclass 138) Apparatus in which the air releasing seal comprises a second liquid trap seal in addition to the air trapping seal necessarily present at the discharge end of the siphon element.