Patent US4662896A successfully refreshed from Google Patents.
US4662896A
Expired / Lapsed
US
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Method of making an abrasive cutting element
Assignee: Diamant Boart Stratabit USA Inc
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Filing: 1986-02-19
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Granted: 1987-05-05
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Expires: 2006-02-19
Abstract
Abstract An abrasive compact is made by a method comprising the steps of providing a circular cylindrical substrate having an upper with a non-circular recess therein defined by non-intersecting side walls. The recess is filled with diamond grains and is positioned in a press. The substrate and diamond grains are subjected to high temperature and pressure conditions in the press to sinter the diamond grains and bond the sintered diamond grains to the substrate in the form of a non-circular diamond layer. The portions of the substrate not covered by the diamond layer are removed.
Inventors
- 👤 Mahlon D. Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:53
CPC Classifications
B; B24; B24D; B24D18/00; B24D18/0009; B24D3/00; B24D3/008
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A method of making an abrasive compact comprising the steps of: providing a circular cylindrical substrate having an upper surface with non-circular recess therein defined by spaced side walls, filling said recess with diamond grains, positioning said substrate and diamond grains in a press; subjecting said substrate and diamond grains to high temperature and pressure conditions in said press to sinter said diamond grains and bond the sintered diamond grains to said substrate in the form of a non-circular diamond layer, and removing portions of said substrate not covered by said diamond layer.
Claim 2
Independent Claim
93 words
A method of making an abrasive compact comprising the steps of: providing a circular cylindrical substrate having an upper surface with non-circular recess therein defined by spaced side walls, filling said recess with diamond grains, positioning said substrate and diamond grains in a press; subjecting said substrate and diamond grains to high temperature and pressure conditions in said press to sinter said diamond grains and bond the sintered diamond grains to said substrate in the form of a non-circular diamond layer, and removing portions of said substrate not covered by said diamond layer.
Claim 3
Independent Claim
42 words
A method according to claim l, wherein said providing step comprises providing a circular cylindrical substrate having an upper surface with a non-circular recess therein defined by non-parallel, non-intersecting side walls in the form of straight chords extending across said upper surface.
Claim 4
Dependent Claim
14 words
A method according to claim 1, wherein said substrate is formed of cemented carbide.
Claim 5
Dependent Claim
13 words
A method according to claim 3, wherein said cemented carbide is tungsten carbide.
Claim 6
Dependent Claim
12 words
A method according to claim 1, wherein said removing step comprises grinding.
Claim 7
Dependent Claim
49 words
A method according to claim 1, wherein said providing step comprises providing a circular cylindrical substrate having an upper surface with a non-circular recess therein defined by first and second pairs of chords, each pair of chords being non-parallel and non-intersecting and lying within respective quadrants of said substrate.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |