U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Earth borer

Patent 6637521 Issued on October 28, 2003. Estimated Expiration Date: Icon_subject July 11, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

1657368

Core bit having axial conical core breaker
Patent #: 4207954
Issued on: 06/17/1980
Inventor: Jerome

Core drill and method of removing a core therefrom
Patent #: 4657445
Issued on: 04/14/1987
Inventor: Bossler

Hollow drill for fabric and the like
Patent #: 5098234
Issued on: 03/24/1992
Inventor: Judkins, et al.

Portable core sampler
Patent #: 6102135
Issued on: 08/15/2000
Inventor: Shaw

Coring bit and method for obtaining a material core sample Patent #: 6412575
Issued on: 07/02/2002
Inventor: Harrigan, et al.

Inventor

Assignee

Application

No. 09/902677 filed on 07/11/2001

US Classes:

175/19, BORING WITHOUT EARTH REMOVAL (I.E., COMPACTING EARTH FORMATION)175/320, WITH TOOL SHAFT DETAIL175/404, With core-breaking means408/204, Having axial, core-receiving central portion408/227Having peripherally spaced cutting edges

Examiners

Primary: Bagnell, David
Assistant: Halford, Brian

Attorney, Agent or Firm

International Classes

E21B 17/046 (20060101)
E21B 17/02 (20060101)
E21B 11/00 (20060101)
E21B 10/02 (20060101)
E21B 10/00 (20060101)

Abstract

An earth borer includes a thin-walled tubular shaft (4), a shank (2) provided at one end of the tubular shaft (4), and a drilling head (5) provided at another, opposite end of the tubular shaft, projecting radially beyond the tubular shaft (4), and having at least one cutter for breaking the bore core and (6, 6a, 6b, 6c, 6d) extending, at least partially, radially inward and at least one internal groove (7, 7a, 7b) associated with the at least one cutter, and a releasable tubular connection member (8) for drivingly connecting the shank (2) with tubular shaft (4) for joint rotation with each other.

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