Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2009-02-26
2011-12-06
Neuder, William P (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S428000, C175S432000
Reexamination Certificate
active
08069937
ABSTRACT:
Embodiments relate to polycrystalline diamond compacts (“PDCs”) including a polycrystalline diamond (“PCD”) table that is substantially free of defects formed due to abnormal grain growth of tungsten carbide grains, and methods of fabricating such PDCs. In an embodiment, a PDC comprises a cemented tungsten carbide substrate including an interfacial surface that is substantially free of tungsten carbide grains exhibiting abnormal grain growth, and a PCD table bonded to the interfacial surface of the cemented tungsten carbide substrate. The PCD table includes a plurality of bonded diamond grains defining a plurality of interstitial regions. At least a portion of the interstitial regions includes a metal-solvent catalyst disposed therein. The PCD table may be substantially free of chromium or the PCD table and the cemented tungsten carbide substrate may each include chromium.
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Bertagnolli Kenneth E.
Mukhopadhyay Debkumar
Sani Mohammad N.
Hutchins Cathleen
Neuder William P
US Synthetic Corporation
Workman Nydegger
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