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US4525178B1
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US4525178B1 - - Google Patents
Assignee: SII MegaDiamond Inc
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Filing: 1984-04-16
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Granted: 1990-03-27
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Expires: 2004-04-16
Abstract
Abstract A composite material is described which includes a mixture of individual diamond crystals and pieces of precemented carbide. The mixture is heated and pressurized to create intercrystalline bonds between the diamond crystals and chemical bonds between the diamond crystals and the precemented carbide pieces. The resulting composite polycrystalline diamond body exhibits excellent wear characteristics and impact resistance.
Inventors
- 👤 R Hall David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:30
CPC Classifications
C; C22; C22C; C22C26/00; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B22; B22F; B22F7/00; B22F7/06; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; B28; B28D; B28D1/00; B28D1/02; B28D1/12; B28D1/121; E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B4/00; E21B4/003; F; F16; F16C; F16C17/00; F16C17/04; F16C17/10; F16C33/00; F16C33/02; F16C33/04; F16C33/043; F16C33/26; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685; B22F2998/00; F16C2206/00; F16C2206/02; F16C2352/00
Claims Analysis
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References Cited (Backward Citations)
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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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |