US3681229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina feeder
Assignee: Alcoa Corp
•
Filing: 1970-07-17
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Granted: 1972-08-01
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Expires: 1990-07-17
Abstract
Abstract APPARATUS FOR FEEDING ALUMINA TO AN ALUMINUMPRODUCING ELECTROLYTIC CELL INCLUDING A FLUIDIZATION TYPE CONVEYOR COMMUNICATING WITH A SUPPLY OF ALUMINA AND HAVING FEED ORIFICES IN ITS SIDE WALL FOR FEEDING ALUMINA INTO THE ELECTROLYTIC CELL ADJACENT VERTICALLY RECIPROCAL PLUNGERS WHICH BREAK THE CRUST ON THE SURFACE OF THE CELL. THE FLUIDIZATION CONVEYOR HAS A POROUS HOSE IN IT FOR INTRODUCING AIR INTO THE ALUMINA TO FLUIDIZE THE ALUMINA SO THAT IT WILL FLOW THROUGH THE CONVEYOR. MEETING APPARATUS WITH FLUIDIZING VALVES THEREIN IS ALSO PROVIDED BETWEEN THE ALUMINA SUPPLY AND THE CONVEYOR FOR SUPPLYING MEASURED QUANTITIES OF ALUMINA INTO THE CONVEYOR FOR FEEDING THE CELL.
Inventors
- 👤 Richard L Lowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:08
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/14; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |