US PATENT SUBCLASS 33 / 304
.~ Borehole direction or inclination

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
304.~ Borehole direction or inclination {6}
305  DF  .~.~> Etching or marking liquid determines orientation
306  DF  .~.~> Fluid (e.g., drilling fluid, etc.) responsive {1}
308  DF  .~.~> Pendulum mounted or directed marker {3}
312  DF  .~.~> Electrical telemetering to read-out
313  DF  .~.~> Inclination and direction indications
314  DF  .~.~> Indicator image projected on sensitized record (e.g., photographic, etc.)

DEFINITION

Classification: 33/304

(under subclass 300) Device comprising means for determining the bearing, or deviation from the vertical, of a deep hole in the earth, such as well bores.

SEE OR SEARCH THIS CLASS, SUBCLASS:

302, for processes used in determining the direction or inclination of boreholes.

SEE OR SEARCH CLASS

73, Measuring and Testing,

152.01+, for means for measuring or testing other physical

conditions of well bores. 175, Boring or Penetrating the Earth,

44, for a process or means for determining the orientation of a core sample, while in situ, combined with a step or means for cutting the core and subclass 45 for a process or means to determine the direction or inclination of an earth boring tool located in a bore hole combined with more than a nominally recited boring step or nominally recited boring apparatus.

340, Communications: Electrical,

853.8, for a wellbore telemetering system having orientation sensing of the subsurface equipment.