US PATENT SUBCLASS 166 / 150
.~.~.~ Passageway controllable by movement of central chamber

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}
150.~.~.~ Passageway controllable by movement of central chamber

DEFINITION

Classification: 166/150

(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 operated or held in position by movement of the central conduit or receptacle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

145, for devices as in this subclass in which fluid flow through a bypass through the packer is stopped when fluid flow to the central chamber is permitted.