Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2011-05-17
2011-05-17
Gay, Jennifer H (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
Reexamination Certificate
active
07942219
ABSTRACT:
PCD constructions include a PCD body comprising a polycrystalline matrix region, a first region that includes a replacement material positioned remote from a body surface, and a second region that is substantially free of the replacement material and that extends a depth from the body surface. The PCD construction can further include a substrate that is attached to the body. The PCD body is formed by removing a solvent catalyst material used to form the body, replacing the removed solvent catalyst material with a replacement material, and then removing the replacement material from a region of the body to thereby form the second region. The replacement material can be introduced into the PCD body during a HPHT process, and the substrate may or may not be the source of the noncatalyzing material.
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Cariveau Peter Thomas
Eyre Ronald K.
Griffo Anthony
Keshavan Madapusi K.
Gay Jennifer H
Harcourt Brad
Osha & Liang LLP
Smith International Inc.
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