Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2009-02-20
2011-12-13
Neuder, William P (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S434000
Reexamination Certificate
active
08074748
ABSTRACT:
Embodiments of the invention relate to thermally-stable polycrystalline diamond (“PCD”) elements, polycrystalline diamond compacts (“PDCs”), and methods of fabricating such PCD elements and PDCs. In an embodiment, a PCD element includes a PCD body comprising bonded diamond grains defining a plurality of interstitial regions. The PCD body includes a first volume having a first portion of the interstitial regions and a second volume having a second portion of the interstitial regions. The PCD body further includes an infiltrant that is disposed in the first portion of the interstitial regions and the second portion of the interstitial regions is substantially free of the infiltrant. The infiltrant comprises a glass, a glass-ceramic, silicone, a thermal decomposition reaction product of silicone, a ceramic having a negative coefficient of thermal expansion, or combinations thereof.
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Cooley Craig H.
Miess David P.
Neuder William P
US Synthetic Corporation
Workman Nydegger
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