Dual-edge working surfaces for polycrystalline diamond...

Details Dual-edge working surfaces for polycrystalline diamond... Dual-edge working surfaces for polycrystalline diamond...

2008-02-26

2009-08-04

Bagnell, Daivd J (Department: 3672)

Boring or penetrating the earth

Processes

C175S430000

Reexamination Certificate

active

07568534

ABSTRACT:
A polycrystalline diamond cutting element for earth boring drill bits presents regions of different abrasion resistance to the earthen formation when in operation. The cutting element has an end working surface and a region which is substantially free of catalyzing material, forming a layer. In operation, this layer wears at a different rate than the underlying material causing a pair of protruding lips to form. The end working surface may be substantially planar or frusto-conical in form.

REFERENCES:
patent: 6248447 (2001-06-01), Griffin et al.
patent: 2006/0060391 (2006-03-01), Eyre et al.
patent: 2007/0039762 (2007-02-01), Achilles
patent: WO 00/28106 (2000-05-01), None

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