US3701826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cubic boron nitride preparation from lithium-boron-nitrogen mixtures
Assignee: General Electric Co
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Filing: 1971-01-28
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Granted: 1972-10-31
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Expires: 1991-01-28
Abstract
Abstract THE PRESENCE OF OXYGEN HAS BEEN FOUND TO BE NECESSARY DURING THE REACTION TO PRODUCE CUBIC BORON NITRIDE CRYSTALS IN THE LITHIUM-BORON-NITROGEN SYSTEM WHEN A LITHIUM-RICH SYSTEM IS EMPLOYED PARTICULARLY IF MUCH OF THE LITHIUM IS PRESENT AS LL3BN2. THE PREFERRED MECHANISM IS TO PROVIDE THE OXYGEN IN THE REACTION MIXUTRE IN THE DESIRED CONCENTRATION BY THE ADDITION OF (A) B2O3 OR (B) A BORON SOURCE PLUS AT LEAST ONE DECOMPOSABLE METAL OXIDE.
Inventors
- 👤 Robert C De Vries
- 👤 James F Fleischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:30
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |