US3572992A
Expired / Lapsed
US
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Preparation of moulded and sintered aluminum nitride
Assignee: Toshiba Corp
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Filing: 1968-07-01
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Granted: 1971-03-30
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Expires: 1988-07-01
Abstract
Abstract A METHOD OF MANUFACTURING A MOULDED AND SINTERED MASS OF ALUMINUM NITRIDE COMPRISING MOULDING AN ADMIXTURE OF ALUMINUM NITRIDE POWDER, ALUMINUM OXIDE POWDER AND METALLIC ALUMINUM POWDER, NITRIDING THE MOULDED MASS IN NITROGEN OR AMMONIA GAS AT A TEMPERATURE BELOW THE MELTING POINT OF METALLIC ALUMINUM, AND SINTERING THE MASS IN NITROGEN OR INERT GAS AT TEMPERATURES RANGING FROM 1,600 TO 2,200*C.
Inventors
- 👤 Katsutoshi Komeya
- 👤 Hiroshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |