US PATENT SUBCLASS 166 / 334.1
.~.~ Vertical movement of conduit

Current as of: June, 1999
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166 /   HD   WELLS

316  DF  VALVES, CLOSURES OR CHANGEABLE RESTRICTORS {5}
332.1  DF  .~ Longitudinally movable operator {8}
334.1.~.~ Vertical movement of conduit {3}
334.2  DF  .~.~.~> And rotational movement; e.g., ball valve-type
334.3  DF  .~.~.~> Drain-type
334.4  DF  .~.~.~> Fluid flow through lateral port to exterior

DEFINITION

Classification: 166/334.1

Vertical movement of conduit:

(under subclass 332.1) Longitudinally movable operator valve comprising a flow regulating device which is actuated by axial shifting of the pipe or tubing string on which the device is supported.