Bradley A Williams

US Patent:

57433461, Apr 28, 1998

Filed:

Mar 6, 1996

Appl. No.:

8/611896

Inventors:

Gary Martin Flood - Canal Winchester OH
David Mark Johnson - Westerville OH
Bradley Earl Williams - Worthington OH

Assignee:

General Electric Company - Pittsfield MA

International Classification:

E21B 1056

US Classification:

1754202

Abstract:

An abrasive cutting element comprised of an abrasive cutting layer and a metal substrate wherein the interface therebetween has a tangential chamfer, the plane of which forms an angle of about 5. degree. to about 85. degree. with the plane of the surface of the cylindrical part of the metal substrate. The abrasive cutting layer is preferably diamond or cubic boron nitride and the metal substrate is preferably tungsten carbide.

US Patent:

58486577, Dec 15, 1998

Filed:

Dec 27, 1996

Appl. No.:

8/777213

Inventors:

Gary Martin Flood - Canal Winchester OH
David Mark Johnson - Westerville OH
Friedel Siegfried Knemeyer - Granville OH
Bradley Earl Williams - Worthington OH

Assignee:

General Electric Company - Pittsfield MA

International Classification:

E21B 1046

US Classification:

175426

Abstract:

The present invention relates to a novel domed polycrystalline diamond cutting element wherein a hemispherical diamond layer is bonded to a tungsten carbide substrate, commonly referred to as a tungsten carbide stud. Broadly, the inventive cutting element includes a metal carbide stud having a proximal end adapted to be placed into a drill bit and a distal end portion. A layer of cutting polycrystalline abrasive material disposed over said distal end portion such that an annulus of metal carbide adjacent and above said drill bit is not covered by said abrasive material layer. The geometry of the diamond cutting element provides control of interfacial stresses and reduces fabrication costs. The diamond cutting element may contain a pattern of ridges or bumps integrally formed in the abrasive layer which ridges are designed to cause high localized stresses in the rock, thus starting a crack. By initiating cracks in localized areas, the crushing action could be performed with less force.

US Patent:

56609361, Aug 26, 1997

Filed:

Nov 1, 1995

Appl. No.:

8/551593

Inventors:

Bradley E. Williams - Worthington OH

Assignee:

General Electric Company - Pittsfield MA

International Classification:

C23C 1626

US Classification:

428408

Abstract:

A multi-surfaced diamond tool having at least two surfaces thereof consisting essentially of fine grained diamonds preferably having an average particle size of about 0. 01. mu. m to about 20. mu. m and a process for preparing the fine grained diamond surfaces by the vapor deposition method. Also included is a diamond tool insert comprising the above diamond tool bonded to a substrate.