Boring or penetrating the earth – With signaling – indicating – testing or measuring – Measuring or indicating drilling fluid rate of flow
Reexamination Certificate
2006-03-21
2006-03-21
Tsay, Frank S. (Department: 3672)
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Measuring or indicating drilling fluid rate of flow
C175S040000
Reexamination Certificate
active
07013991
ABSTRACT:
An obstacle avoidance system for obstacle detection in an opaque material. The system includes at least one electromagnetic signal source adapted to produce an electromagnetic source signal suitable for transmission through the opaque material, at least one electromagnetic signal detector adapted to receive reflected electromagnetic energy signals from discontinuities in the opaque material encountered by the electromagnetic source signal, and a reflected electromagnetic energy signal processor suitable for determining a presence of obstructions and/or strata variations within the opaque material. The system is preferably integral with a head element suitable for traversing the opaque material, for example a subterranean drill bit.
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du Toit Leendert Johannes
Hanson David R.
Inggs Michael R.
Kothari Kirankumar M.
Wilson-Langman Alan
Fejer Mark E.
Gas Technology Institute
Tsay Frank S.
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