Apparatus for use in drilling
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United States of America Patent
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-
Jun 1, 1982
Grant Date -
N/A
app pub date -
Dec 19, 1977
filing date -
Jan 11, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drill element in the form of a drill rod, a sleeve for coupling together two drill rods or a drill bit; the drill element having a single start internal or external cylindrical screw thread by which it is intended to be coupled to a further drill element in the assembly of a drill string for percussion or rotary/percussion drilling.
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