US3093570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory lining for alumina reduction cells
Assignee: Reynolds Metals Co
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Filing: 1959-10-20
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Granted: 1963-06-11
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Expires: 1979-10-20
Abstract
No abstract record available.
Inventors
- 👤 John L Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:12
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/085; C04; C04B; C04B35/00; C04B35/515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE METHOD OF FORMING A REFRACTORY LINING IN AN ALUMINA REDUCTION CELL WHICH COMPRISES THE STEPS OF PREPARING A MIXTURE CONSISTING ESSENTIALLY OF 20 TO 75% ALUMINA, THE BALANCE ESSENTIALLY CRYOLITE, IN THE FORM OF POWDER, PLACING THE MIXTURE INTO A REDUCTION CELL AND THEN PUTTING THE CELL IN OPERATION TO CAUSE THE MIXTURE TO SINTER IN A REGION EXTENDING FROM THE MOLTEN ZONE INWARDLY OF THE REFRACTORY.
Claim 2
Independent Claim
68 words
THE METHOD OF FORMING A REFRACTORY LINING IN AN ALUMINA REDUCTION CELL WHICH COMPRISES THE STEPS OF PREPARING A MIXTURE CONSISTING ESSENTIALLY OF 20 TO 75% ALUMINA, THE BALANCE ESSENTIALLY CRYOLITE, IN THE FORM OF POWDER, PLACING THE MIXTURE INTO A REDUCTION CELL AND THEN PUTTING THE CELL IN OPERATION TO CAUSE THE MIXTURE TO SINTER IN A REGION EXTENDING FROM THE MOLTEN ZONE INWARDLY OF THE REFRACTORY.
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) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |