US5217081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tools for cutting rock drilling
Assignee: Diamant Boart Stratabit SA
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Filing: 1991-06-14
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Granted: 1993-06-08
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Expires: 2011-06-14
Abstract
Abstract The present invention relates to a rock bit insert of cemented carbide for cutting rock drilling. The insert is provided with one or more bodies or layers of diamond or cBN produced at high pressure and high temperature in the diamond or cBN stable area. The body of cemented carbide has a multi-structure containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt next to the eta-phase zone.
Inventors
- 👤 Mats G. Waldenstrom
- 👤 Udo K. R. Fischer
- 👤 Lars H. Hillert
- 👤 Mahlon D. Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567; E21B10/573; E21B10/5735; C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
44 words
A rock cutter insert for cutting rock drilling comprising a body of cemented carbide containing diamond and/or cBN bonded at high pressure and high temperature, said insert having a multi-phase structure with a core containing eta-phase surrounded by a surface zone free of eta-phase.
Claim 2
Dependent Claim
44 words
A rock cutter insert for cutting rock drilling comprising a body of cemented carbide containing diamond and/or cBN bonded at high pressure and high temperature, said insert having a multi-phase structure with a core containing eta-phase surrounded by a surface zone free of eta-phase.
Claim 3
Dependent Claim
33 words
The rock cutter insert of claim 1, wherein the binder phase content of the cemented carbide in a zone close to the eta-phase containing core is higher than the nominal binder phase content.
Claim 4
Dependent Claim
25 words
The rock cutter insert of claim 2, wherein the binder phase content in the surface of said insert is 0.1-0.9 the nominal binder phase content.
Claim 5
Dependent Claim
31 words
The rock cutter insert of to claim 1, wherein the grain size of the hard phase is preferably 80% by volume of 40 mm and 20% by volume 10 mm material.
Claim 6
Dependent Claim
15 words
The rock cutter insert of claim 1, wherein said insert is a disc-shaped cutter insert.
Claim 7
Dependent Claim
33 words
The rock cutter insert of claim 5, wherein at least a portion of the said diamond and/or cBN is in the form of a body embedded in the said body of cemented carbide.
Claim 8
Dependent Claim
23 words
The rock cutter insert of claim 6, wherein said portion is embedded in one or more stripes across the surface of said body.
Claim 9
Dependent Claim
18 words
The rock cutter insert of claim 6, wherein said portion is embedded in one or more circular portions.
Claim 10
Dependent Claim
29 words
The rock cutter insert of claim 1, wherein said diamond and/or cBN is in the form of a layer at least partly covering the top surface of said insert.
Claim 11
Dependent Claim
34 words
The rock cutter insert of claim 6, wherein at least another portion of said diamond and/or cBN is in the form of a layer at least partly covering the top surface of said insert.
Claim 12
Dependent Claim
23 words
The rock cutter insert of claim 10, wherein at least a portion of said layer covers at least a portion of said body.
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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) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |