Controlling an underground object

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment

Reexamination Certificate

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Details

C324S326000, C175S045000, C175S057000

Reexamination Certificate

active

06980123

ABSTRACT:
In order to control the sonde of an underground object, such as an underground boring tool, a predetermined sequence of rotation steps is applied to the object and that sequence is detected. The detection of the appropriate sequence causes the sonde to change its function, for example by changing the carrier frequency of the signal transmitted by the sonde on to change the data output sequence or transfer rate, or to change output power. While it is possible to use a single rotation step, the use of more than one step, with each step to be carried out within a predetermined time, reduces the risk of error.

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Search Report of Nov. 9, 1999.
Search Report of Aug. 2, 2000.

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