Patent US3672831A successfully refreshed from Google Patents.
US3672831A
Expired / Lapsed
US
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Process for the preparation of fine-sized aluminas
Assignee: HEYMAN C DUECKER
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Filing: 1969-10-08
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Granted: 1972-06-27
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Expires: 1989-10-08
Abstract
Abstract A PROCESS FOR THE PREPARATION OF SUB-MICRON SIZED ALUMINA POWDERS BY THE THERMAL DECOMPOSITION AND/OR DEHYDRATION OF THOSE ALUMINUM COMPOUNDS WHICH ON HEATING UNDER CARFULLY CONTROLLED CONDITIONS WILL YIELD THE OXIDE.
Inventors
- 👤 Heyman C Duecker
- 👤 Rimantas Glemza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:48
CPC Classifications
C; C10; C10L; C10L7/00; C10L7/02; C10L7/04; C01; C01F; C01F7/00; C01F7/02; C01F7/30; C01F7/306; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2006/00; C01P2006/12; C01P2006/80; C01P2006/82
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |