Patent US5761484A successfully refreshed from Google Patents.
Patent US3976444A successfully refreshed from Google Patents.
US3976444A
Expired / Lapsed
US
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Production of improved boron abrasives
Assignee: RTX Corp
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Filing: 1974-10-25
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Granted: 1976-08-24
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Expires: 1994-10-25
Abstract
Abstract A boron abrasive is produced by crystallization of amorphous boron in the presence of and/or admixture with heavy metal borides. Boron filaments may be crystallized by being subjected to elevated temperatures, less than the melting point of boron, prior to shearing into short lengths and grinding into powder. Alternatively, boron in bulk form may be heated above the melting point and seeded with a material which will cause the formation of crystalline borides; the resulting product when cooled including solidified borides and crystalline boron which may be ground to powder.
Inventors
- 👤 Donald K. Kuehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:26
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0036; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A method for the production of an abrasive material comprising the steps of: heating elemental boron to a temperature above its melting point; seeding the molten boron with 1-10% by weight seed crystals of an elemental metal selected from the group consisting of W, Mo and Ta to form crystalline borides thereof; and cooling the mixture to cause formations of beta-rhombohedral boron with solidified borides distributed therein.
Claim 2
Independent Claim
67 words
A method for the production of an abrasive material comprising the steps of: heating elemental boron to a temperature above its melting point; seeding the molten boron with 1-10% by weight seed crystals of an elemental metal selected from the group consisting of W, Mo and Ta to form crystalline borides thereof; and cooling the mixture to cause formations of beta-rhombohedral boron with solidified borides distributed therein.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |