US PATENT SUBCLASS 166 / 180
.~ Adjustable over pipe or set over prepositioned pipe


Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
180.~ Adjustable over pipe or set over prepositioned pipe


DEFINITION

Classification: 166/180

(under subclass 179) Devices comprising a laterally expansible blocking portion (1) intended to be positioned around and form a seal with a fluid conducting pipe which is already in place in the well or (2) which is so constructed that it may be expanded and contracted in the well to form a seal between the surrounding conduit and an inner concentric fluid conducting pipe at different positions along the pipe.