.~ 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.
