Boring or penetrating the earth – Processes – Sampling of earth formations
Reexamination Certificate
2006-12-14
2009-12-08
Bomar, Shane (Department: 3676)
Boring or penetrating the earth
Processes
Sampling of earth formations
C175S403000, C175S405100
Reexamination Certificate
active
07628228
ABSTRACT:
Core drill bits with long crown heights are described herein. The core drill bits have a series of slots or openings that are not located at the tip of the crown and are therefore enclosed in the body of the crown. The slots may be staggered and/or stepped throughout the crown. As the cutting portion of the drill bit erodes through normal use, the fluid/debris notches at the tip of the bit are eliminated. As the erosion progresses, the slots become exposed and then they function as fluid/debris ways. This configuration allows the crown height to be extended and lengthened without substantially reducing the structural integrity of the drill bit.
REFERENCES:
patent: 2966949 (1961-01-01), Wepsala, Jr.
patent: RE26669 (1969-09-01), Henderson
patent: 4128136 (1978-12-01), Generoux
patent: 4208154 (1980-06-01), Gundy
patent: 4499959 (1985-02-01), Grappendorf
patent: 5025871 (1991-06-01), Stewart
patent: 5069584 (1991-12-01), Obermeier et al.
patent: 5316416 (1994-05-01), Kim
patent: 5628376 (1997-05-01), Kleine
patent: 5823276 (1998-10-01), Beck, III
patent: 5836409 (1998-11-01), Vail, III
patent: 5932508 (1999-08-01), Armstrong et al.
patent: 6595844 (2003-07-01), Mizuno et al.
patent: 2005/0016775 (2005-01-01), Hiranuma et al.
patent: 2007/0246266 (2007-10-01), Larbo
patent: WO 0192677 (2001-12-01), None
patent: WO 2006/004494 (2006-01-01), None
patent: WO2006004494 (2006-01-01), None
patent: WO 2006/076795 (2006-07-01), None
Drivdahl K. Shayne
Rupp Michael D.
Bomar Shane
Longyear TM, Inc.
Workman Nydegger
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