US PATENT SUBCLASS 137 / 136
.~.~ Release of trapped air


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.~.~ Release of trapped air {2}
137  DF  .~.~.~> Through float-operated vent
138  DF  .~.~.~> Through liquid trap seal {1}


DEFINITION

Classification: 137/136

(under subclass 132) Apparatus in which the liquid accumulating in the siphon chamber traps air in the siphon element and means is provided to release such trapped air to initiate liquid flow through the siphon.

SEE OR SEARCH THIS CLASS, SUBCLASS:

143, for siphon venting or breaking.

144, for removal of the air which accumulates in siphons during use.

SEE OR SEARCH CLASS

4, Baths, Closets, Sinks, and Spittoons,

369+, for water closet flush tanks having an outlet siphon which is prevented from discharging until air is positively release therefrom.