US PATENT SUBCLASS 137 / 206
.~ Gas pressure storage over or displacement of liquid

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

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
206.~ Gas pressure storage over or displacement of liquid {5}
207  DF  .~.~> Surge suppression
207.5  DF  .~.~> With return of liquid to supply
208  DF  .~.~> Plural units
209  DF  .~.~> With gas maintenance or application {3}
213  DF  .~.~> With liquid level responsive gas vent or whistle {1}

DEFINITION

Classification: 137/206

(under subclass 154) Apparatus wherein a gas under pressure is provided over a body of liquid or is utilized to displace a liquid and a definite coaction exists between the gas and liquid which affects the system.

(1) Note. The usual purpose for mere storage of gas over liquid is for an air cushion or surge eliminating means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

145, for application of pressure to liquid in a siphon chamber to initiate a flow through a siphon connected thereto.

156+, for liquid feed traps utilizing a gas pressure for discharge.

170.1+, for diverse fluid containing pressure systems in which the fluids are in the form of a liquid impregnated with gas and there are means for controlling the degree of froth or foam formed in the handling of such fluids.

SEE OR SEARCH CLASS 222, Dispensing,

61+, 258, 261 to 263 and 396+ for dispensers with fluid pressure discharge assistants.

417, Pumps,

118+, for liquid pumping by supplying or exhausting gaseous motive fluid to or from a liquid pumping chamber.