US PATENT SUBCLASS 166 / 144
.~.~.~ Bottom supported casing or screen section

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}
143  DF  .~.~ Central conduit detachable {1}
144.~.~.~ Bottom supported casing or screen section

DEFINITION

Classification: 166/144

(under subclass 143) Devices in which the central chamber is a central conduit and is detachably attached to the lower portion of a casing or screen section which carries the packer sealing portion so that the central conduit supports the casing or screen section against the action of gravity while it is being lowered into the well.