US PATENT SUBCLASS 137 / 155
.~ Gas lift valves for wells

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

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
155.~ Gas lift valves for wells

DEFINITION

Classification: 137/155

(under subclass 154) Apparatus which controls a gas to be injected or introduced into the liquid column of well to elevate the liquid.

SEE OR SEARCH CLASS

417, Pumps,

109, for aerated column type pumps combined with valve means for a controlling a gas inlet.