US PATENT SUBCLASS 166 / 351
.~ Means removably connected to permanent well structure

Current as of: June, 1999
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166 /   HD   WELLS

335  DF  SUBMERGED WELL {10}
351.~ Means removably connected to permanent well structure {7}
352  DF  .~.~> Surface vessel {3}
356  DF  .~.~> Means to provide protective environment for operative access below surface of water
357  DF  .~.~> Separator
358  DF  .~.~> Drilling means
359  DF  .~.~> Removable riser
360  DF  .~.~> Well component assembly means
361  DF  .~.~> Pipe cutting means

DEFINITION

Classification: 166/351

Means removably connected to permanent well structure:

(under subclass 335) Process or apparatus intended to be used in the operation or formation of a well and intended to be removable from the well without destruction of the well.

(1) Note. A derrick including structure of this class will

be found in this subclass or the subclasses indented hereunder even if there is no specific disclosure of subsequent removal from the well.

SEE OR SEARCH THIS CLASS, SUBCLASS:

358, for well drilling combined with derrick structure in a device of this subclass.