US3586487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuously digesting alumina
Assignee: ALUTERV ALUMINIUMIPARI TERVEZOE INTEZET
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Filing: 1969-04-21
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Granted: 1971-06-22
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Expires: 1989-04-21
Abstract
Abstract ALUMINA IS DIGESTED BY THE BAYER PROCESS INTHE TUBE SIDE OF A TUBE-AND-SHELL HEAT EXCHANGER HEATED BY STEAM FLASHED FROM THE DIGESTED SLURRY. A PLURALITY OF SEPARATE SHELLS ARE ARRANGED END-TO-END WITH TUBE SHEETS BETWEEN THEM AND WITH THE TUBES EXTENDING THROUGH THEM IN SERIES. EACH TUBE IS SEPARATELY VALVED FOR SIMULTANEOUS WASHING OF SELECTED TUBES WHILE THE OTHER TUBES ARE ON STREAM.
Inventors
- 👤 Adam Juhasz
- 👤 Laszlo Mahig
- 👤 Albert Nagy
- 👤 Gyorgy Sigmond
- 👤 Janos Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:08
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0006; B01J19/0013; C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/062; C01F7/0626; C01F7/064; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00085; B01J2219/00105; B01J2219/00114; B01J2219/00164
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |