Indicator of direction of force traversing natural media > Borehole direction or inclination > Pendulum mounted or directed marker > Includes magnetic directional indicator > Patents

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Class Information
Number: 33/310
Name: Geometrical instruments > Indicator of direction of force traversing natural media > Borehole direction or inclination > Pendulum mounted or directed marker > Includes magnetic directional indicator
Description: Device provided with means influenced by a magnetic field to determine the bearing of the well bore.

Patents under this class:

Patent Number	Title Of Patent	Date Issued
7386942	Method and apparatus for mapping the trajectory in the subsurface of a borehole	Jun. 17, 2008
6227310	Method and apparatus for providing a magnetic direction reference	May. 8, 2001
6176128	Borehole tilt meter	Jan. 23, 2001
5258755	Two-source magnetic field guidance system	Nov. 2, 1993
5201128	Miniature gimbal mounted magnetic field detectors	Apr. 13, 1993
4956921	Method to improve directional survey accuracy	Sep. 18, 1990
4747317	System for surveying fluid transmission pipelines and the like	May. 31, 1988
4157619	Inclination and direction responsive apparatus	Jun. 12, 1979