US4430187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction cell pot
Assignee: SWISS ALUMINIUM Ltd A SWISS CORP
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Filing: 1982-04-15
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Granted: 1984-02-07
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Expires: 2002-04-15
Abstract
Abstract A reduction cell pot used in the production of aluminum by fused salt electrolysis comprising an outer steel shell, a thermally insulating layer and an inner lining comprised essentially of carbon. At least the lower 80% of the floor insulation, preferably at least the lower 90%, comprises a layer of volcanic ash which has been compacted by mechanical means. The rest of the floor insulation consists of a leakage barrier which protects the volcanic ash from bath components which penetrate the carbon lining.
Inventors
- 👤 Sveinn Snaeland
- 👤 Ragnar Halldorsson
- 👤 Alwis Franke
- 👤 Einar Gudmundsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:07
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
An electrolytic cell used in the production of aluminum comprising an outer steel sheel having a floor and side walls, a layer of insulation in the form of volcanic ash is provided on said floor of said outer steel shell, a carbon lining for containing the aluminum produced and an insulating leakage barrier provided between said volcanic ash layer of insulation and said carbon lining.
Claim 2
Dependent Claim
65 words
An electrolytic cell used in the production of aluminum comprising an outer steel sheel having a floor and side walls, a layer of insulation in the form of volcanic ash is provided on said floor of said outer steel shell, a carbon lining for containing the aluminum produced and an insulating leakage barrier provided between said volcanic ash layer of insulation and said carbon lining.
Claim 3
Dependent Claim
22 words
An electrolytic cell according to claim 1 wherein said volcanic ash layer of insulation comprises at least 80% of the floor insulation.
Claim 4
Dependent Claim
22 words
An electrolytic cell according to claim 1 wherein said volcanic ash layer of insulation comprises at least 90% of the floor insulation.
Claim 5
Dependent Claim
19 words
An electrolytic cell according to claim 1 wherein said insulating leakage barrier is in the form of alumina powder.
Claim 6
Dependent Claim
25 words
An electrolytic cell according to claim 1 wherein an impermeable layer is provided between said volcanic ash layer of insulation and said insulating leakage barrier.
Claim 7
Dependent Claim
23 words
An electrolytic cell according to claim 5 wherein said impermeable layer comprises an impermeable flexible graphite membrane joined to a steel supporting foil.
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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |