US PATENT SUBCLASS 166 / 184
.~ With controllable passage between central conduit and space above packer or plug


Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
184.~ With controllable passage between central conduit and space above packer or plug


DEFINITION

Classification: 166/184

(under subclass 179) Devices comprising a packer or plug adapted to be supported from the top of the well by a central conduit for insertion thereby into the well and a fluid passage between said central conduit and the annular space above the packer or plug between the central conduit and the surrounding conduit, fluid flow in the passage being controllable or changeable by a valve, a closure or a changeable restriction, as defined in subclass 224.

SEE OR SEARCH THIS CLASS, SUBCLASS:

123+, 143+ and 181+, for a central conduit detachable from a packer or plug, a fluid passage above the packer or plug being opened when the central conduit is detached.

127, for a device comprising an expanding anchor, spaced packer or plug seals and a controllable passage between a central conduit and the space between the packer or plug seals.

129+, and 183, for a central conduit with a packer, the conduit passage being continued past the packer blocking means and there being a controllable bypass through the packer outside of the central conduit passage.

131, for a device comprising an expanding anchor, a packer or plug and a controllable passage between a central conduit and the space above the packer or plug.

147, for a central conduit with spaced packer or plug seals and a controllable passage between the conduit and the space between packer or plug seals. 149+, for a central conduit with a packer and a controllable passage between the conduit and the space above the packer and also the space below the packer.