US3692479A
Expired / Lapsed
US
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Preparation of binary borides,carbides and silicides
Assignee: GEOFFREY W MEADOWS
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Filing: 1968-09-10
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Granted: 1972-09-19
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Expires: 1988-09-10
Abstract
Abstract BINARY CRABIDWS, BORIDES AND SILICIDES, SUCH AS TUNGSTEN CARBIDE, HAVING AN AVERAGE PARICLE SIZE OF LESS THAN A MICRON, ARE PREPARED BY REACTING A PAIR OF SUITABLE REACTANTS SUCH AS TUNGSTIC OXIDE AND CALCIUM CARBIDE, IN A MOLTEN METAL HALIDE BATH SUCH AS SODIUM CHLORIDE, AT A TEMPERATURE OF BETWEEN 200 AND 1200*C. IN THE PRESENCE OF AN ALKALI METAL OR ALKALINE EARTH METAL REDUCING AGENT. THE BINARY COMPOUNDS THUS PRODUCED ARE PARTICULARLY USEFUL IN PREPARING HARD, DENSE REFRACTORY MATERIALS.
Inventors
- 👤 Geoffrey W Meadows
- 👤 Paul C Yates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:51
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5626; B; B82; B82Y; B82Y30/00; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/949; C01B33/00; C01B33/06; C01B35/00; C01B35/02; C01B35/04; C04B35/5611; C04B35/5622; C04B35/563; C04B35/565; C04B35/58; C04B35/58007; C04B35/58014; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078; C04B35/58085; C04B35/58092; C01P; C01P2002/00; C01P2002/60; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/80
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |