US2587328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of alumina-containing materials
Assignee: Reynolds Metals Co
•
Filing: 1946-02-12
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Granted: 1952-02-26
•
Expires: 1966-02-12
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:51
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/38; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN THE METHOD OF PURIFYING ALUMINA-CONTAINING MATERIALS HAVING OXIDIC IMPURITIES INCLUDING FE2O3, SIO2 AND TIO2 BY PROVIDING IN A REDUCTION CHAMBER A MIXTURE OF ALUMINA-CONTAINING MATERIAL, CRYOLITE AND CARBON, HEATING THE MIXTURE TO A SUFFICIENT TEMPERATURE TO DISSOLVE THE ALUMINA IN THE CRYOLITE AND REDUCING A LARGE PART OF THE IRON OXIDE, SEPARATING THE REDUCED IRON FROM THE FUSION AND PASSING THE FUSION THROUGH A HEATED CARBON FILTER TO REDUCE REMAINING IRON OXIDE, AND REMOVING THE IRON REDUCED IN THE FILTER FROM THE FUSION, THE IMPROVEMENT WHICH COMPRISES CONFINING WITHIN THE REDUCTION CHAMBER THE GASES GENERATED BY THE REDUCTION, AND APPLYING THE PRESSURE OF SUCH GASES TO FORCE THE FUSION TO PASS THROUGH THE HEATED CARBON FILTER.
Claim 2
Dependent Claim
117 words
IN THE METHOD OF PURIFYING ALUMINA-CONTAINING MATERIALS HAVING OXIDIC IMPURITIES INCLUDING FE2O3, SIO2 AND TIO2 BY PROVIDING IN A REDUCTION CHAMBER A MIXTURE OF ALUMINA-CONTAINING MATERIAL, CRYOLITE AND CARBON, HEATING THE MIXTURE TO A SUFFICIENT TEMPERATURE TO DISSOLVE THE ALUMINA IN THE CRYOLITE AND REDUCING A LARGE PART OF THE IRON OXIDE, SEPARATING THE REDUCED IRON FROM THE FUSION AND PASSING THE FUSION THROUGH A HEATED CARBON FILTER TO REDUCE REMAINING IRON OXIDE, AND REMOVING THE IRON REDUCED IN THE FILTER FROM THE FUSION, THE IMPROVEMENT WHICH COMPRISES CONFINING WITHIN THE REDUCTION CHAMBER THE GASES GENERATED BY THE REDUCTION, AND APPLYING THE PRESSURE OF SUCH GASES TO FORCE THE FUSION TO PASS THROUGH THE HEATED CARBON FILTER.
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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) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |