US PATENT SUBCLASS 166 / 151
.~.~.~ Passageway valve directly responsive to fluid pressure

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
142  DF  .~ With controllable passage between central chamber and space below packer {7}
149  DF  .~.~ With passageway between central chamber and space above packer {2}
151.~.~.~ Passageway valve directly responsive to fluid pressure

DEFINITION

Classification: 166/151

(under subclass 149) Devices in which fluid flow through the passageway between the central conduit or receptacle and the space above the packer is controllable by a valve, openable closure or changeable restriction which is responsive to fluid pressure exerted directly upon it by contact with the fluid whose flow is being controlled.

(1) Note. A valve, closure or changeable restriction operated by a dropped ball or other means acted on by fluid pressure is not considered within the definition of this subclass. See subclass 149 for such devices used to control the passageway between the central chamber and the space above the packer.