DAVID LAWRENCE JOHNSON
Pilots at Storington Rd, Westerville, OH

6045440, Apr 4, 2000

Nov 20, 1997

8/975429

David Mark Johnson - Westerville OH
Gary Martin Flood - Canal Winchester OH
Henry Samuel Marek - Worthington OH

General Electric Company - Pittsfield MA

B23F 2103, B23F 2123, B24B 3300

451540

The present invention relates to supported polycrystalline diamond compact cutters (PDC cutters) made under high temperature, high pressure (HT/HP) processing conditions, and more particularly to supported PDC cutters having non-planar cutting surfaces. More specifically, the present invention is for an oriented PDC cutter wherein chips and debris are funneled away from the cutting edge by a raised top surface of the polycrystalline diamond layer (PCD layer). The redirection of the debris is achieved by the creation of high and low regions on the PCD layer, of which there can be a variety of different surface geometry's. Thus, an object of the present invention is to provide a PDC cutter with improved performance through channeling debris away from its cutting edge.

6042463, Mar 28, 2000

Nov 20, 1997

8/975028

David M. Johnson - Westerville OH
Frederic J. Klug - Schenectady NY

General Electric Company - Pittsfield MA

B23F 2103

451540

A supported polycrystalline compact (PC) cutter made under high temperature, high pressure (HT/HP) processing conditions having non-planar interfaces between the PC layer and a cemented carbide support layer. The carbide PC interface geometry is such that one or more protrusions extend from the support layer into the PC layer. The protrusions have a low cobalt metal binder content of about 3-9% by weight. The low cobalt metal binder content in the protrusions results in enhanced performance and improved resistance to cracking during installation and/or to brazing breakage.

5848657, Dec 15, 1998

Dec 27, 1996

8/777213

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

General Electric Company - Pittsfield MA

E21B 1046

175426

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.

5957005, Sep 28, 1999

Oct 14, 1997

8/950004

Erik O. Einset - Delaware OH
David M. Johnson - Westerville OH

General Electric Company - Pittsfield MA

B21C 302

761074

The present invention is addressed to improving a blank for a wire drawing die formed from an annular cemented metal carbide support component having a lengthwise extent from an entrance end to an exit end and extending radially about a central longitudinal axis to define a cylindrical internal bore through the lengthwise extent, and a cylindrical sintered polycrystalline compact component received within the bore of the support component and bonded thereto at an interface surface extending a radial distance from and along the longitudinal axis from a wire drawing entrance end to a wire drawing exit end. The compact component is adapted to receive an aperture extending through its lengthwise extent about the central longitudinal axis and is configured with an entrance zone at the die entrance end which tapers inwardly therefrom to a reduction zone whereat a wire to be drawn through the aperture makes initial contact with the compact component, and thence to a bearing zone and an exit zone. The improvement in such wire drawing die blank revolves the radial distance from said central longitudinal axis to said interface surface tapers inwardly from the entrance end to a minimum prior to the bearing zone after which said radial distance remains substantially constant to said exit end. The corresponding wire drawing die and the method for producing the inventive wire drawing blank also form additional aspects of the present invention.

6314836, Nov 13, 2001

Jul 21, 1999

9/358271

Erik O. Einset - Delaware OH
David M. Johnson - Westerville OH

General Electric Company - Pittsfield MA

B21C 302

761074

The present invention is addressed to improving a blank for a wire drawing die formed from an annular cemented metal carbide support component having a lengthwise extent from an entrance end to an exit end and extending radially about a central longitudinal axis to define a cylindrical internal bore through the lengthwise extent, and a cylindrical sintered polycrystalline compact component received within the bore of the support component and bonded thereto at an interface surface extending a radial distance from and along the longitudinal axis from a wire drawing entrance end to a wire drawing exit end. The compact component is adapted to receive an aperture extending through its lengthwise extent about the central longitudinal axis and is configured with an entrance zone at the die entrance end which tapers inwardly therefrom to a reduction zone whereat a wire to be drawn through the aperture makes initial contact with the compact component, and thence to a bearing zone and an exit zone. The improvement in such wire drawing die blank revolves the radial distance from said central longitudinal axis to said interface surface tapers inwardly from the entrance end to a minimum prior to the bearing zone after which said radial distance remains substantially constant to said exit end. The corresponding wire drawing die and the method for producing the inventive wire drawing blank also form additional aspects of the present invention.

5829541, Nov 3, 1998

Dec 27, 1996

8/777222

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

General Electric Company - Pittsfield MA

E21B 1046

175426

This 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, a pattern of ridges or bumps is 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.

5486137, Jan 23, 1996

Jul 6, 1994

8/271307

Gary M. Flood - Canal Winchester OH
David M. Johnson - Westerville OH
Henry S. Marek - Worthington OH

General Electric Company - Worthington OH

E21B 1046

451540

Disclosed is an abrasive tool insert having an abrasive particle layer having an upper surface, an outer periphery, and a lower surface integrally formed on a substrate which defines an interface therebetween. The abrasive particle layer outer periphery forms a cutting plane. The thickness of the abrasive particle layer at its outer periphery cutting plane decreases radially inwardly. Thus, the interface can have a sawtooth shape cross-sectional profile, at least one slot extending from said abrasive particle layer outer periphery radially inwardly, or other configuration based on the precepts of the present invention. Also, the angle of the outwardly sloping profile can be matched to the anticipated angle of the wear plane which will develop as the PDC wears in use.

5484330, Jan 16, 1996

Jul 21, 1993

8/095631

Gary M. Flood - Canal Winchester OH
David M. Johnson - Westerville OH

General Electric Company - Worthington OH

E21B 1046

451540

An abrasive tool insert comprises a cemented metallic substrate and a polycrystalline diamond layer formed thereon by high pressure, high temperature processing. The interface between the substrate and the diamond layer forms a sawtooth shaped cross-sectional profile including a number of surfaces sloping outwardly and downwardly toward a cutting edge of the insert.

5494477, Feb 27, 1996

Aug 11, 1993

8/105523

Gary M. Flood - Canal Winchester OH
David M. Johnson - Westerville OH
Henry S. Marek - Worthington OH

General Electric Company - Worthington OH

E21B 1046

451540

An abrasive tool insert comprises a cemented substrate and a polycrystalline diamond layer formed thereon by high pressure, high temperature processing. The interface between the substrate and the diamond layer comprises at least one angled profile wherein said profile slopes downwardly and outwardly toward the periphery of the insert.