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Class Information
Number: 175/403
Name: Boring or penetrating the earth > Bit or bit element > Core forming type
Description: Apparatus in which the cutter element or cutting edge of the bit is so arranged that the bit makes an annular cut in the formation and leaves a central undisturbed portion of the formation in the form of a cylinder.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7373994 |
Self cleaning coring bit |
May. 20, 2008 |
| 7341118 |
Rotating dry drilling bit |
Mar. 11, 2008 |
| 7341120 |
Blade edge structure for core drill |
Mar. 11, 2008 |
| 7234547 |
Apparatus and methods for sponge coring |
Jun. 26, 2007 |
| 7231991 |
Apparatus and methods for sponge coring |
Jun. 19, 2007 |
| 7219753 |
Tool holder for annular core bit |
May. 22, 2007 |
| 7131506 |
Flightless rock auger for use with pressure drills with quick attachment and method of use |
Nov. 7, 2006 |
| 7073797 |
Tool holder for annular core bit |
Jul. 11, 2006 |
| 7028790 |
Rotary drill bit |
Apr. 18, 2006 |
| 7021404 |
Method and device for deviated coring and/or drilling |
Apr. 4, 2006 |
| 7004265 |
Apparatus and methods for sponge coring |
Feb. 28, 2006 |
| 6959771 |
Abrasive and boring method using the same |
Nov. 1, 2005 |
| 6948574 |
Ultrasonic annular core bit |
Sep. 27, 2005 |
| 6945339 |
Core drill |
Sep. 20, 2005 |
| 6908264 |
Quick change drill bit |
Jun. 21, 2005 |
| 6814167 |
Boring device and boring method |
Nov. 9, 2004 |
| 6732818 |
Oriented core barrel system |
May. 11, 2004 |
| 6719070 |
Apparatus and methods for sponge coring |
Apr. 13, 2004 |
| 6619413 |
Flightless rock auger for use with pressure drills with quick attachment and method of use |
Sep. 16, 2003 |
| 6558089 |
Extender assembly for core drill |
May. 6, 2003 |
| 6514017 |
Core drill piloting system |
Feb. 4, 2003 |
| 6494276 |
Rock auger with pilot drill |
Dec. 17, 2002 |
| 6412575 |
Coring bit and method for obtaining a material core sample |
Jul. 2, 2002 |
| 6394717 |
High speed-perforating apparatus |
May. 28, 2002 |
| 6158534 |
Core sampler |
Dec. 12, 2000 |
| 6129163 |
Flightless rock auger with quick attachment and method of use |
Oct. 10, 2000 |
| 6024168 |
Wellborne mills & methods |
Feb. 15, 2000 |
| 5980168 |
Hollow crown drill |
Nov. 9, 1999 |
| 5901799 |
Connection for first and second members |
May. 11, 1999 |
| 5884714 |
Method and apparatus for fluid and soil sampling |
Mar. 23, 1999 |
| 5823275 |
High-speed drill for rock stake engineering |
Oct. 20, 1998 |
| 5813802 |
Drilling tool assembly and its center drill and cup shape drill |
Sep. 29, 1998 |
| 5655613 |
Drill bit |
Aug. 12, 1997 |
| 5628376 |
Drilling tool bit with a carrier member and cutter members |
May. 13, 1997 |
| 5569002 |
Hollow annular drill bit with hollow cylindrical carrier member |
Oct. 29, 1996 |
| 5497843 |
Hollow auger head assembly |
Mar. 12, 1996 |
| 5454437 |
Roller cone core bit |
Oct. 3, 1995 |
| 5394952 |
Core cutting rock bit |
Mar. 7, 1995 |
| 5379852 |
Core drill bit |
Jan. 10, 1995 |
| RE34435 |
Whirl resistant bit |
Nov. 9, 1993 |
| 5137098 |
Diamond tool for drilling and routing |
Aug. 11, 1992 |
| 5082070 |
Hollow drill bit |
Jan. 21, 1992 |
| 5069584 |
Hollow drilling tool |
Dec. 3, 1991 |
| 5038859 |
Cutting tool for removing man-made members from well bore |
Aug. 13, 1991 |
| 5012863 |
Pipe milling tool blade and method of dressing same |
May. 7, 1991 |
| 4981183 |
Apparatus for taking core samples |
Jan. 1, 1991 |
| 4968101 |
Vertical asphalt and concrete miller |
Nov. 6, 1990 |
| 4946000 |
Undisturbed soil sampler |
Aug. 7, 1990 |
| 4941783 |
Drilling device |
Jul. 17, 1990 |
| 4915182 |
Cutter elements for hollow drill bit |
Apr. 10, 1990 |
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