US PATENT SUBCLASS 166 / 126
.~.~ With controllable passage between central chamber and space below packer

Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
118  DF  .~ With expanding anchor {12}
126.~.~ With controllable passage between central chamber and space below packer {2}
127  DF  .~.~.~> Spaced packer or plug seals
128  DF  .~.~.~> Passage controllable by movement of central chamber

DEFINITION

Classification: 166/126

(under subclass 118) Devices with a controllable passage between a central chamber comprising a central conduit or a

receptacle and a space below a packer, as set forth in subclass 142.

SEE OR SEARCH THIS CLASS, SUBCLASS:

120+, (especially 122), for devices as defined in subclass 126 in which the expanding anchor is actuated to setting position by fluid pressure.

123, for devices as defined in subclass 126 in which the central conduit is a detachable setting tool.