Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2005-05-26
2009-02-24
Wright, Giovanna C (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S374000, C175S426000, C428S408000
Reexamination Certificate
active
07493973
ABSTRACT:
PCD materials comprise a diamond body having bonded diamond crystals and interstitial regions disposed among the crystals. The diamond body is formed from diamond grains and a catalyst material at high pressure/high temperature conditions. The diamond grains have an average particle size of about 0.03 mm or greater. At least a portion of the diamond body has a high diamond volume content of greater than about 93 percent by volume. The entire diamond body can comprise high volume content diamond or a region of the diamond body can comprise the high volume content diamond. The diamond body includes a working surface, a first region substantially free of the catalyst material, and a second region that includes the catalyst material. At least a portion of the first region extends from the working surface to depth of from about 0.01 to about 0.1 mm.
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Griffo Anthony
Janssen Michael
Keshavan Madapusi K.
Shen Yuelin
Zhang Youhe
Connolly Bove & Lodge & Hutz LLP
Smith International Inc.
Wright Giovanna C
LandOfFree
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