Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2006-02-10
2010-11-30
Stephenson, Daniel P (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S434000
Reexamination Certificate
active
07841428
ABSTRACT:
Methods of manufacturing polycrystalline diamond are disclosed. More particularly, a mixture including diamond and fullerenes may be provided. Further, the mixture may be exposed to a high pressure, high temperature sintering process. In addition, a volume of polycrystalline diamond bonded to a substrate may be formed by providing a mixture including diamond and fullerenes and exposing the mixture to a high pressure, high temperature sintering process. A drill bit for drilling a subterranean formation is disclosed. Further, polycrystalline diamond compacts are disclosed including polycrystalline diamond bonded to a substrate, wherein the polycrystalline diamond includes less than about 1% by weight or is substantially free of non-fullerenes, non-diamond carbon. Polycrystalline diamond exhibiting an increased diamond volume fraction due to the presence of fullerenes during manufacture relative to polycrystalline diamond formed without fullerenes is disclosed.
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Holland & Hart LLP
Stephenson Daniel P
US Synthetic Corporation
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