Boring or penetrating the earth – Boring without earth removal
Reexamination Certificate
2006-08-22
2006-08-22
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Boring without earth removal
C175S073000, C175S296000, C175S400000
Reexamination Certificate
active
07093671
ABSTRACT:
The invention relates to a method for horizontal ground-boring, in particular for rock-boring, by a rotating and hammering driven ground-boring device, whereby the device is alternately or simultaneously supplied with compressed air and drilling medium and the compressed air and drilling medium are supplied through a channel.
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Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Dang Hoang
Tracto-Technik GmbH
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