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Class Information
Number: 175/386
Name: Boring or penetrating the earth > Bit or bit element > Bit with leading portion (e.g., pilot) forming smaller diameter initial bore > Leading portion is separable starter
Description: Apparatus in which the leading or pilot portion comprises a readily removable starter element for cooperating with the trailing portion to form a shallow, accurately positioned bore, the trailing portion then being described as usable independently of the starter element to continue the boring operation.










Patents under this class:

Patent Number Title Of Patent Date Issued
8418784 Central cutting region of a drilling head assembly Apr. 16, 2013
8286731 Method and apparatus for constructing deep vertical boreholes and underground cut-off walls Oct. 16, 2012
8056649 Apparatus and methods for drilling wellbores that utilize a detachable reamer Nov. 15, 2011
8042625 Drilling tool Oct. 25, 2011
7182156 System for overburden drilling Feb. 27, 2007
6523624 Sectional drive system Feb. 25, 2003
6457909 Multi-purpose anchor bolt assembly Oct. 1, 2002
5931614 Annular bit having a center drill Aug. 3, 1999
5657820 Two trip window cutting system Aug. 19, 1997
5427191 Auger head assembly and method of drilling hard earth formations Jun. 27, 1995
5366031 Auger head assembly and method of drilling hard earth formations Nov. 22, 1994
5252009 Industrial and roadway identification and floor surface treatment system, and diamond surface drill bit for use in installing the system Oct. 12, 1993
4979848 Drilling device Dec. 25, 1990
4819744 Funnel hole ice auger Apr. 11, 1989
RE32267 Process for drilling underground arcuate paths and installing production casings, conduits, or flow pipes therein Oct. 21, 1986
4319648 Process for drilling underground arcuate paths and installing production casings, conduits, or flow pipes therein Mar. 16, 1982
4078622 Road surface recessing device Mar. 14, 1978











 
 
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