Patent US5590727A successfully refreshed from Google Patents.
US5590727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool component
Assignee: Individual
•
Filing: 1995-06-15
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Granted: 1997-01-07
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Expires: 2015-06-15
Abstract
Abstract A tool component comprises abrasive compact, typically a diamond abrasive compact, having a flat working surface which presents a cutting edge and an opposite surface bonded to a surface of a cemented carbide substrate to define an interface having at least two steps. The steps extend from one surface of the component to another surface and the interface is spaced from the working surface at one of the component surfaces a greater distance than at the other component surface. The tool component has particular application as a cutting insert for a rotatable cutter of an earth boring bit.
Inventors
- 👤 Klaus Tank
- 👤 Kevin P. Ashby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/573; E21B10/5735; E21B10/50; E21B10/52
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
155 words
An earth boring bit comprising at least one rotatable cutter which is rotatably mounted on a shaft and which has a plurality of cutting inserts located in a working surface thereof, characterized in that at least some of the cutting inserts are tool components, wherein each tool component comprises an abrasive compact having a flat working surface presenting a cutting edge and an opposite surface bonded to a surface of a cemented carbide substrate to define an interface having at least two steps, the steps extending from one surface of the component to another surface and the interface being spaced from the working surface at one of the component surfaces a greater distance than at the other component surface, and each tool component having a longitudinal axis, and the tool components are so located in the cutter that the longitudinal axis is at an angle other than 90° to the working surface of the cutter.
Claim 2
Dependent Claim
155 words
An earth boring bit comprising at least one rotatable cutter which is rotatably mounted on a shaft and which has a plurality of cutting inserts located in a working surface thereof, characterized in that at least some of the cutting inserts are tool components, wherein each tool component comprises an abrasive compact having a flat working surface presenting a cutting edge and an opposite surface bonded to a surface of a cemented carbide substrate to define an interface having at least two steps, the steps extending from one surface of the component to another surface and the interface being spaced from the working surface at one of the component surfaces a greater distance than at the other component surface, and each tool component having a longitudinal axis, and the tool components are so located in the cutter that the longitudinal axis is at an angle other than 90° to the working surface of the cutter.
Claim 3
Dependent Claim
32 words
An earth boring bit according to claim 1, wherein each tool component is so embedded in the working surface that the interface lies at or below the working surface of the cutter.
Claim 4
Dependent Claim
18 words
An earth boring bit according to claim 1, wherein the angle is in the range 30 to 60°.
Claim 5
Dependent Claim
15 words
An earth boring bit according to claim 1 which is of right circular cylindrical shape.
Claim 6
Dependent Claim
24 words
An earth boring bit according to claim 1 wherein the interface extends from one side surface of the component to an opposite side surface.
Claim 7
Dependent Claim
19 words
An earth boring bit according to claim 1 wherein the interface meets the working surface of the abrasive compact.
Claim 8
Dependent Claim
16 words
An earth boring bit according to claim 1 wherein the interface has at least three steps.
Claim 9
Dependent Claim
29 words
An earth boring bit according to claim 1 wherein each step has a first surface which is substantially parallel to the working surface and a second surface transverse thereto.
Claim 10
Dependent Claim
23 words
An earth boring bit according to claim 1 wherein the steps define concentric arcs, when viewed in a plan through the working surface.
Claim 11
Dependent Claim
22 words
An earth boring bit according to claim 1 wherein the steps define parallel lines, when viewed in plan through the working surface.
Claim 12
Dependent Claim
20 words
An earth boring bit according to claim 1 wherein the abrasive compact is a diamond or cubic boron nitride compact.
Claim 13
Dependent Claim
30 words
An earth boring bit according to claim 1 wherein the cemented carbide is selected from cemented tungsten carbide, cemented tantalum carbide, cemented titanium carbide, cemented molybdenum carbide and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-01-07 | 2000-07-08 | 2001-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-07 | 2004-07-08 | 2005-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-07 | 2008-07-08 | 2009-01-07 | $7700.00 | Window Closed / Lapsed |