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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 |
| 4884638 |
Soil coring device with a core ejector mechanism |
Dec. 5, 1989 |
| 4854396 |
Pivoting cutter for ice coring auger |
Aug. 8, 1989 |
| 4790396 |
Rotary drill bits for use in coring holes in subsurface formations |
Dec. 13, 1988 |
| 4779689 |
Soil auger |
Oct. 25, 1988 |
| 4739844 |
Hammer drill bit and sub-assembly |
Apr. 26, 1988 |
| 4679636 |
Method and apparatus for coring rock |
Jul. 14, 1987 |
| 4667754 |
Flexible plug for obtaining soil samples during drilling operations |
May. 26, 1987 |
| 4657441 |
Penetration conductor pipe drive shoe |
Apr. 14, 1987 |
| 4651835 |
Core catcher for use with an hydraulically displaced inner tube in a coring tool |
Mar. 24, 1987 |
| 4629011 |
Method and apparatus for taking core samples from a subterranean well side wall |
Dec. 16, 1986 |
| 4552231 |
Rotating pilot core bit for use in highly fractured formations |
Nov. 12, 1985 |
| 4534773 |
Abrasive product and method for manufacturing |
Aug. 13, 1985 |
| 4534231 |
Method and device for taking soil samples |
Aug. 13, 1985 |
| 4457765 |
Abrasive bodies |
Jul. 3, 1984 |
| 4456078 |
Earth boring method and apparatus |
Jun. 26, 1984 |
| 4440247 |
Rotary earth drilling bit |
Apr. 3, 1984 |
| 4296822 |
Multipurpose fluid flow assisted downhole tool |
Oct. 27, 1981 |
| 4281722 |
Retractable bit system |
Aug. 4, 1981 |
| 4248313 |
Earth boring auger |
Feb. 3, 1981 |
| 4177867 |
Self-drilling dowel with an inclined rolling head |
Dec. 11, 1979 |
| 4168755 |
Nutating drill bit |
Sep. 25, 1979 |
| 4128136 |
Drill bit |
Dec. 5, 1978 |
| 4098361 |
Drilling head connection for use in a reverse circulation system |
Jul. 4, 1978 |
| 4098362 |
Rotary drill bit and method for making same |
Jul. 4, 1978 |
| 4056152 |
Drill bit for reinforced concrete |
Nov. 1, 1977 |
| 3999619 |
Core barrel |
Dec. 28, 1976 |
| 3999620 |
Core barrel |
Dec. 28, 1976 |
| 3981371 |
Core sampling drill |
Sep. 21, 1976 |
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