US PATENT SUBCLASS 166 / 139
.~.~.~ Threaded element rotated


Current as of: June, 1999
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166 /   HD   WELLS

179  DF  PACKERS OR PLUGS {17}
118  DF  .~ With expanding anchor {12}
138  DF  .~.~ Wedge or cam and friction drag {2}
139.~.~.~ Threaded element rotated


DEFINITION

Classification: 166/139

(under subclass 138) Devices in which interengaging screw threads on different parts are relatively rotated in order to set the anchor, packer or plug.

(1) Note. The rotation may occur as a preliminary operation or during the setting operation proper.