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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 |
| 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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