Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2011-04-25
2011-11-22
Neuder, William P (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C051S308000
Reexamination Certificate
active
08061458
ABSTRACT:
A polycrystalline diamond compact useful for wear, cutting, drilling, drawing and like applications is provided with a first diamond region remote from the working surface which has a metallic catalyzing material and a second diamond region adjacent to or including the working surface containing a non-metallic catalyst and the method of making such a compact is provided. This compact is particularly useful in high temperature operations, such as hard rock drilling because of the improved thermal stability at the working surface.
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Bertagnolli Kenneth E.
Vail Michael A.
Holland & Hart LLP
Neuder William P
US Synthetic Corporation
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