US3591338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of metal nitrides
Assignee: EIDP Inc
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Filing: 1968-06-05
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Granted: 1971-07-06
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Expires: 1988-06-05
Abstract
Abstract THE PROCESS FOR PREPARING NITRIDES OF GROUP IV-B AND GROUP V-B METALS BY REACTING THE METAL HALIDE WITH AMMONIA TO FORM THE METAL AMIDOHALIDE FOLLOWED BY DECOMPOSITION IS AMMONIA OR NITROGEN AT UP TO 400*C. TO FORM THE METAL NITROGEN HALIDE AND DECOMPOSITION IN AMMONIA OR NITROGEN AT 900 TO 1200*C. TO FORM THE METAL NITRIDE, IS IMPROVED BY CARRYING OUT THE DECOMPOSITION STEPS IN THE PRESENCE OF FROM 0.1 TO 1 PART BY VOLUME OF HYDROGEN PER PART BY VOLUME OF NITROGEN OR AMMONIA.
Inventors
- 👤 William O Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:34
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/076; C01B21/0763; C01B21/0615; C01B21/062; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/58007; C04B35/58014; C01P; C01P2002/00; C01P2002/60; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/80
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |