US PATENT SUBCLASS 340 / 853.5
.~.~.~ Control of drilling apparatus using magnetic field

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


340 /   HD   COMMUNICATIONS: ELECTRICAL

853.1  DF  WELLBORE TELEMETERING OR CONTROL (E.G., SUBSURFACE TOOL GUIDANCE, DATA TRANSFER, ETC.) {14}
853.3  DF  .~ Selective control of subsurface equipment {2}
853.4  DF  .~.~ In horizontal or inclined drilling or passage {1}
853.5.~.~.~ Control of drilling apparatus using magnetic field

DEFINITION

Classification: 340/853.5

Control of drilling apparatus using magnetic field:

(under subclass 853.4) Subject matter having a drilling device and a magnetic field detector for control of the drilling device.

(1) Note. The sensed magnetic field may be either the earth's magnetic field or an applied magnetic field.