Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2007-07-17
2007-07-17
Bates, Zakiya W. (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S375000, C175S434000, C175S435000
Reexamination Certificate
active
10726387
ABSTRACT:
Composite constructions comprise a plurality of granules that are arranged together in a randomly-oriented manner. The granules each comprise an ordered arrangement of a first material phase and a second material phase, wherein the first and second material phases are each continuous, and each occupy different and distinct regions of the granule. At least a portion of the first and second material phases of each granule are in contact with one another. The first material phase comprises a material selected from the group consisting of cermet materials, polycrystalline diamond, polycrystalline cubic boron nitride, and mixtures thereof. The second material phase comprises a material that is relatively softer, e.g., more ductile, than the first material phase.
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Bates Zakiya W.
Jeffer Mangels Butler & Marmaro LLP
Smith International Inc.
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