US2732283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
O minutes
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
•
Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:31
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01D; C01D1/00; C01D1/04; C01D1/28; C01F7/46; C01F7/48; C01F7/50; C01F7/54; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A METHOD OF RECOVERING CRYOLITE, ALUMINA, AND OTHER BATH VALUES WHICH HAVE BECOME CONTAMINATED WITH CARBON DURING ALUMINUM REDUCTION CELL OPERATION WHICH COMPRISES THE STEPS OF PREHEATING THE CONTAMINATED VALUES IN PARTICULATE FORM AT A TEMPERATURE BELOW THE FUSION POINT OF SODIUM HYDROXIDE AND IN CONTACT WITH CARBON DIOXIDE GAS FOR A TIME SUFFICIENT TO CONVERT SUBSTANTIALLY ALL THE CONTAINED SODIUM HYDROXIDE TO SODIUM CARBONATE, AND SUBSEQUENTLY HEATING THE CONTAMINATED VALUES AT A TEMPERATURE SUFFICIENT TO CAUSE OXIDATION AND REMOVAL OF SUBSTANTIALLY ALL OF THE CARBON.
Claim 2
Independent Claim
86 words
A METHOD OF RECOVERING CRYOLITE, ALUMINA, AND OTHER BATH VALUES WHICH HAVE BECOME CONTAMINATED WITH CARBON DURING ALUMINUM REDUCTION CELL OPERATION WHICH COMPRISES THE STEPS OF PREHEATING THE CONTAMINATED VALUES IN PARTICULATE FORM AT A TEMPERATURE BELOW THE FUSION POINT OF SODIUM HYDROXIDE AND IN CONTACT WITH CARBON DIOXIDE GAS FOR A TIME SUFFICIENT TO CONVERT SUBSTANTIALLY ALL THE CONTAINED SODIUM HYDROXIDE TO SODIUM CARBONATE, AND SUBSEQUENTLY HEATING THE CONTAMINATED VALUES AT A TEMPERATURE SUFFICIENT TO CAUSE OXIDATION AND REMOVAL OF SUBSTANTIALLY ALL OF THE CARBON.
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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) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |