US PATENT SUBCLASS 137 / 247.11
.~ Liquid seal in liquid flow line; flow liquid forms seal

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

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
247.11.~ Liquid seal in liquid flow line; flow liquid forms seal {8}
247.13  DF  .~.~> Valves {1}
247.25  DF  .~.~> Seal replenishers
247.27  DF  .~.~> Plural inlet
247.29  DF  .~.~> Divided and recombined passages
247.31  DF  .~.~> Tangential inlet flow
247.33  DF  .~.~> Downward partition encircles projecting outlet
247.35  DF  .~.~> Submerged inlet pipe end {2}
247.41  DF  .~.~> U-seals {3}

DEFINITION

Classification: 137/247.11

(under subclass 247) Apparatus comprising a U-shaped flow passage which retains a portion of a line flow liquid to provide a gas seal in the said line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138+, for periodic siphon discharge through liquid trap seals.

171+, for diverse fluid containing pressure systems with fluid separating traps, especially subclasses 177+ for a

discriminating outlet for liquid.

216.1+, for a vented siphon breaking system including a liquid seal.

251, for seals utilizing a diverse liquid. SEE OR SEARCH CLASS

210, Liquid Purification or Separation, appropriate subclasses for separation apparatus comprising liquid seals, particularly

163+, for grated inlet surface drains, subclasses 295+ for grated inlet catch basins, subclasses 116 and 119 for the same with a backflow preventing float or filtrate accumulation responsive valve, respectively, and subclasses 532.1+ for catch basins with gravitational separation.