Patent US4786379A successfully refreshed from Google Patents.
US4786379A
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Measuring current distribution in an alumina reduction cell
Assignee: Reynolds Metals Co
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Filing: 1988-02-22
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Granted: 1988-11-22
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Expires: 2008-02-22
Abstract
Abstract A method and apparatus are disclosed for measuring the current distribution in an alumina reduction cell. The apparatus includes sensors attached to the anodes of the cell, a remote computer system for receiving and correlating data received from the sensors and a means for transmitting and receiving the data from the sensors to the remote computer.
Inventors
- 👤 Wray M. Barnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:17
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
A method for determining current distribution among the anodes of a single alumina reduction cell comprising concurrently measuring individual current levels at a selected plurality of said anodes within said cell, transmitting said individual current levels to an electrically isolated computer and calculating the current distribution within said cell based upon said individual current levels.
Claim 2
Independent Claim
55 words
A method for determining current distribution among the anodes of a single alumina reduction cell comprising concurrently measuring individual current levels at a selected plurality of said anodes within said cell, transmitting said individual current levels to an electrically isolated computer and calculating the current distribution within said cell based upon said individual current levels.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said transmitting comprises radio transmission.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said transmitting comprises optoisolation transmission.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said transmitting comprises fiber optics transmission.
Claim 6
Dependent Claim
18 words
The method of claim 1 further comprising optimizing said current distribution by modifying the operation of said cell.
Claim 7
Dependent Claim
17 words
The method of claim 6 wherein said optimizing comprises raising and/or lowering certain anodes within said cell.
Claim 8
Dependent Claim
19 words
The method of claim 6 wherein said optimizing comprises changing the rate of feed of alumina to said cell.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein individual current levels at each anode are measured and transmitted.
Claim 10
Dependent Claim
12 words
The method of claim 1 further comprising modeling said alumina reduction cell.
Claim 11
Dependent Claim
17 words
The method of claim 1 further comprising designing an alumina reduction cell having an optimized current distribution.
References Cited (Backward Citations)
SU188017A1
Cited
US2918646A
Cited
US3491002A
Cited
US3380897A
Cited
US3625842A
Cited
US3622475A
Cited
US3649954A
Cited
US3644877A
Cited
US3812024A
Cited
US4035771A
Cited
US4024034A
Cited
SU487165A1
Cited
US4109309A
Cited
US4153321A
Cited
US4333803A
Cited
US4517059A
Cited
US4448661A
Cited
US4638441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |