Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2003-12-23
2008-12-30
Neuder, William P (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S434000, C076S108200
Reexamination Certificate
active
07469757
ABSTRACT:
The present invention provides a bit with cutting structures or inserts that include diamond particles, in which the diamond-impregnated inserts are surrounded by substantially diamond-free support members. The diamond-impregnated inserts are manufactured separately from the bit body. Once formed, the diamond-impregnated inserts are affixed to the substantially diamond-free support members on bit body by brazing or other means of attachment. The total thermal exposure of the diamond particles during manufacture in accordance with the present invention is significantly lower than the total manufacturing-related thermal exposure in previously known diamond-impregnated cutting structures. Furthermore, the substantially diamond-free support members allow the bit to continue cutting through a formation without an increased contact area, as experienced by bits with diamond-impregnated ribs. Thus, the operating life of the cutting structures, and therefore the life of the bit itself, is increased.
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Patents Act 1977: Search Report under Section 17 for Application No. GB 0329855.1 dated Mar. 26, 2004 (2 p.).
Azar Michael G.
Beaton Timothy
Conley & Rose, P.C.
Neuder William P
Smith International Inc.
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