US5379853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond drag bit cutting elements
Assignee: Smith International Inc
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Filing: 1993-09-20
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Granted: 1995-01-10
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Expires: 2013-09-20
Abstract
Abstract A unitized polycrystalline composite diamond stud type drag bit cutter having no high temperature braze of a PDC wafer to a carbide stud is disclosed. The diamond cutting surface may be planar, convex, curved or a truncated cone. The unitized construction of the cutter eliminates the problems associated with the high temperature brazing of a PDC wafer to a carbide stud.
Inventors
- 👤 Michael C. Lockwood
- 👤 Richard H. Dixon
- 👤 Christopher A. Reed
- 👤 Ronald B. Crockett
- 👤 Kenneth W. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:05
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
An insert stud cutter comprising; a tungsten carbide cylindrical body, said body forming a first cylindrical base end, said second cutter end having at least one ultra hard layer directly bonded to a pre-formed surface by said second cutter end, said ultra hard layer may comprise one or more layers of tape cast material.
Claim 2
Dependent Claim
54 words
An insert stud cutter comprising; a tungsten carbide cylindrical body, said body forming a first cylindrical base end, said second cutter end having at least one ultra hard layer directly bonded to a pre-formed surface by said second cutter end, said ultra hard layer may comprise one or more layers of tape cast material.
Claim 3
Dependent Claim
15 words
The invention as set forth in claim wherein hard layer may comprise injection molded material.
Claim 4
Dependent Claim
17 words
The invention as set forth in claim 1 wherein said ultra hard layer may comprise extruded material.
Claim 5
Dependent Claim
65 words
A diamond insert stud cutter for a rock bit comprising; a tungsten carbide cylindrical body, said body forming a first cylindrical base end, and a second cutter end, said second cutter end having at least one diamond layer directly bonded to a pre-formed surface formed by said second cutter end by a high pressure, high temperature sintering process, said pre-formed surface is a truncated cone.
Claim 6
Dependent Claim
65 words
A diamond insert stud cutter for a rock bit comprising; a tungsten carbide cylindrical body, said body forming a first cylindrical base end, and a second cutter end, said second cutter end having at least one diamond layer directly bonded to a pre-formed surface formed by said second cutter end by a high pressure, high temperature sintering process, said pre-formed surface is a truncated cone.
Claim 7
Dependent Claim
27 words
The invention as set forth in claim 4 wherein said diamond may comprise one or more layers of diamond tape cast material sintered to said pre-formed surface.
Claim 8
Dependent Claim
22 words
The invention as set forth in claim 4 wherein said diamond may comprise injection molded diamond material sintered to said pre-formed surface.
Claim 9
Dependent Claim
21 words
The invention as set forth in claim 4 wherein said diamond may comprise extruded diamond material sintered to said pre-formed surface.
Claim 10
Dependent Claim
66 words
An insert stud cutter for rock bits comprising; a tungsten carbide cylindrical body, said body forming a first cylindrical base end, and a second cutter end, said second cutter end having at least one layer of Cubic Boron Nitride directly bonded to a pre-formed surface formed by said second cutter end by a high pressure, high temperature sintering process, said pre-formed surface is a truncated cone.
Claim 11
Dependent Claim
66 words
An insert stud cutter for rock bits comprising; a tungsten carbide cylindrical body, said body forming a first cylindrical base end, and a second cutter end, said second cutter end having at least one layer of Cubic Boron Nitride directly bonded to a pre-formed surface formed by said second cutter end by a high pressure, high temperature sintering process, said pre-formed surface is a truncated cone.
Claim 12
Dependent Claim
31 words
The invention a set forth in claim 8 wherein said Cubic Boron Nitride may comprise one or more layers of Cubic Boron Nitride tape cast material sintered to said pre-formed surface.
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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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |