US2828186A
Expired / Lapsed
US
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Process and apparatus for the production of aluminum oxide
Assignee: Godfrey L Cabot Inc
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Filing: 1956-03-02
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Granted: 1958-03-25
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Expires: 1976-03-02
Abstract
No abstract record available.
Inventors
- 👤 Robert W Dingman
- 👤 Laurent P Michel
- 👤 William D Schaeffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:50
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/30; C01F7/32; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A PROCESS FOR THE PRODUCTION OF ALUMINUM OXIDE FROM ALUMINUM SULFATE WHICH COMPRISES THE STEPS OF INTRODUCING HYDRATED ALUMINUM SULFATE IN SOLID PARTICULATE FORM INCLUDING FINES AT A CONTROLLED RATE INTO THE UPPER END OF AN ELONGATED, VERTICALLY DISPOSED REACTION ZONE HEATED EXTERNALLY TO AN INTERNAL TEMPERATURE ABOVE THE DECOMPOSITION TEMPERATURE OF ALUMINUM SULFATE, THEREBY DECOMPOSING THE ALUMINUM SULFATE TO ALUMINUM OXIDE AND GASEOUS OXIDES OF SULFUR AND LIBERATING THE WATER THEREFROM AS THE SULFATE FLOWS BY GRAVITY THROUGH SAID REACTION ZONE, REMOVING THE GASEOUS OXIDES AND WATER VAPOR FROM THE UPPER END OF SAID ZONE, COLLECTING THE SOLID ALUMINUM OXIDE IN THE LOWER END OF SAID ZONE OUT OF CONTACT WITH SAID GASEOUS OXIDES AND WATER VAPOR, HEATING THE ALUMINUM OXIDE THEREIN IN A SUBSTANTIALLY MOISTURE-FREE ATMOSPHERE TO DECOMPOSE THE MAJOR PORTION OF THE SULFATE REMAINING ADSORBED THEREON, RECOVERING THE ALUMINUM OXIDE, AND RECYCLING THE FINES TO THE REACTION ZONE.
Claim 2
Dependent Claim
151 words
A PROCESS FOR THE PRODUCTION OF ALUMINUM OXIDE FROM ALUMINUM SULFATE WHICH COMPRISES THE STEPS OF INTRODUCING HYDRATED ALUMINUM SULFATE IN SOLID PARTICULATE FORM INCLUDING FINES AT A CONTROLLED RATE INTO THE UPPER END OF AN ELONGATED, VERTICALLY DISPOSED REACTION ZONE HEATED EXTERNALLY TO AN INTERNAL TEMPERATURE ABOVE THE DECOMPOSITION TEMPERATURE OF ALUMINUM SULFATE, THEREBY DECOMPOSING THE ALUMINUM SULFATE TO ALUMINUM OXIDE AND GASEOUS OXIDES OF SULFUR AND LIBERATING THE WATER THEREFROM AS THE SULFATE FLOWS BY GRAVITY THROUGH SAID REACTION ZONE, REMOVING THE GASEOUS OXIDES AND WATER VAPOR FROM THE UPPER END OF SAID ZONE, COLLECTING THE SOLID ALUMINUM OXIDE IN THE LOWER END OF SAID ZONE OUT OF CONTACT WITH SAID GASEOUS OXIDES AND WATER VAPOR, HEATING THE ALUMINUM OXIDE THEREIN IN A SUBSTANTIALLY MOISTURE-FREE ATMOSPHERE TO DECOMPOSE THE MAJOR PORTION OF THE SULFATE REMAINING ADSORBED THEREON, RECOVERING THE ALUMINUM OXIDE, AND RECYCLING THE FINES TO THE REACTION ZONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |