US PATENT SUBCLASS 166 / 149
.~.~ With passageway between central chamber and space above packer

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.~.~ With passageway between central chamber and space above packer {2}
150  DF  .~.~.~> Passageway controllable by movement of central chamber
151  DF  .~.~.~> Passageway valve directly responsive to fluid pressure

DEFINITION

Classification: 166/149

(under subclass 142) Devices in which there is also a passageway between the central conduit or receptacle and the annular space above the packer and outside of the central conduit or receptacle.

(1) Note. The central chamber may comprise concentric conduits each of which forms a "chamber", one having a passage to the space beneath the packer and one having a passageway to the space above the packer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

131, and 184, for devices in which there is a central conduit carrying a packer and a controllable passage between the conduit and the space above the packer.

143+, for devices as in subclass 149 comprising a passageway provided between a central chamber and the space above the packer due to the disconnection of the central chamber from the packer, or a passageway provided between a setting tool and a concentric screen section carrying a packer.

146, for devices as in subclass 149 and in which the passageway is continuously open and there is an additional packer carried by the central chamber above the passageway outlet.