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US2887361A
Expired / Lapsed
US
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Purification of alumina
Assignee: Alcan Research and Development Ltd
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Filing: 1956-10-24
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Granted: 1959-05-19
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Expires: 1976-10-24
Abstract
No abstract record available.
Inventors
- 👤 Fenerty Michael John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:03
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/46; C01P; C01P2002/00; C01P2002/60; C01P2004/00; C01P2004/20; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
PROCEDURE FOR PURIFICATION OF LUMINA TO REMOVE SODA, COMPRISING ADVANCING ALUMINA IN DIVIDED FORM ALONG A PREDETERMINED PATH WHILE SUPPLYING HEAT THERETO, FOR DISCHARGE OF A CALCINED PRODUCT, AND INTRODUCING INTO THE ALUMINA AT A HIGH TEMPERATURE ZONE OF SAID PATH, WHERE THE ALUMINA IS HIGHLY HEATED, ANMOUNTED OF AN ADDITIVE CONSISTING OF A FLUORIDE COMPOUND CAPABLE OF REACTING WITH SODA CONTAMINATION IN THE ALUMINA TO YIELD A SODIUM COMPOUND REMOVABLE WITH THE GASES FROM THE HEATED ZONE, SAID ADDITIVE BEING A SUBSTANCES WHICH HAS THE CHEMICAL CHARACTERISTIC OF REACTING WITH SODA AS AFORESAID AND WHICH IS A MINERALIZER ADAPTED TO PROMOTE CRYSTALLINE PROPERTIES IN THE CALCINNED ALUMINA.
Claim 2
Dependent Claim
108 words
PROCEDURE FOR PURIFICATION OF LUMINA TO REMOVE SODA, COMPRISING ADVANCING ALUMINA IN DIVIDED FORM ALONG A PREDETERMINED PATH WHILE SUPPLYING HEAT THERETO, FOR DISCHARGE OF A CALCINED PRODUCT, AND INTRODUCING INTO THE ALUMINA AT A HIGH TEMPERATURE ZONE OF SAID PATH, WHERE THE ALUMINA IS HIGHLY HEATED, ANMOUNTED OF AN ADDITIVE CONSISTING OF A FLUORIDE COMPOUND CAPABLE OF REACTING WITH SODA CONTAMINATION IN THE ALUMINA TO YIELD A SODIUM COMPOUND REMOVABLE WITH THE GASES FROM THE HEATED ZONE, SAID ADDITIVE BEING A SUBSTANCES WHICH HAS THE CHEMICAL CHARACTERISTIC OF REACTING WITH SODA AS AFORESAID AND WHICH IS A MINERALIZER ADAPTED TO PROMOTE CRYSTALLINE PROPERTIES IN THE CALCINNED ALUMINA.
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) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |