US2989372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of alumina
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-02-24
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Granted: 1961-06-20
•
Expires: 1975-02-24
Abstract
No abstract record available.
Inventors
- 👤 George R Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:35
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR THE PRODUCTION OF ALUMINA WHICH COMPRISES REACTING ALUMINUM METAL IN A REACTION ZONE WITH A DILUTE AQUEOUS SOLUTION OF SODIUM ALUMINATE CONTAINING EXCESS SODIUM HYDROXIDE AND CONTAINING SODIUM ALUMINATE IN A CONCENTRATION BETWEEN ABOUT 1 AND 20 PARTS BY WEIGHT (CALCULATED AS NAALO2) PER 100 PARTS BY WEIGHT OF WATER TO FORM AND PRECIPITATE ALUMINUM HYDROXIDE, RECOVERING THE PRECIPITATED ALUMINUM HYDROXIDE FROM THE DILUTE AQUEOUS SODIUM ALUMINATE SOLUTION AND DRYING AND CALCINING THE RECOVERED ALUMINUM HYDROXIDE TO PRODUCE ALUMINA.
Claim 2
Dependent Claim
82 words
A PROCESS FOR THE PRODUCTION OF ALUMINA WHICH COMPRISES REACTING ALUMINUM METAL IN A REACTION ZONE WITH A DILUTE AQUEOUS SOLUTION OF SODIUM ALUMINATE CONTAINING EXCESS SODIUM HYDROXIDE AND CONTAINING SODIUM ALUMINATE IN A CONCENTRATION BETWEEN ABOUT 1 AND 20 PARTS BY WEIGHT (CALCULATED AS NAALO2) PER 100 PARTS BY WEIGHT OF WATER TO FORM AND PRECIPITATE ALUMINUM HYDROXIDE, RECOVERING THE PRECIPITATED ALUMINUM HYDROXIDE FROM THE DILUTE AQUEOUS SODIUM ALUMINATE SOLUTION AND DRYING AND CALCINING THE RECOVERED ALUMINUM HYDROXIDE TO PRODUCE ALUMINA.
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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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |