US3679361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for alum cracking and the so obtained products
Assignee: Individual
•
Filing: 1970-01-21
•
Granted: 1972-07-25
•
Expires: 1990-01-21
Abstract
Abstract A MOLTEN ALUM, IS SUBJECTED TO DEHYDRATION AT A TEMPERATURE OF 95-300*C.-WHICH CAN POSSIBLY BE GRADUATED IN DIFFERENT PERCENTAGES-AND CALCINATION, EITHER IN THE SAME APPARATUS OR IN TWO DIFFERENT APPARATURSES, THAT IS IN A DEHYDRATING AND CALCINATING APPARATUS RESPECTIVELY; CARRYING OUT THE OPERATIONS PREFERABLY IN A FLUIDIZED BED FURNACE AND AT A CALCINATION TEMPERATURE IN A RANGE OF 575*C.-1200*C. SULPHUR DIOXIDE-FROM WHICH SULPHURIC ACID IS SUCCESSIVELY PREPARED-ALUMINA AND ALKALI SULPHATES ARE OBTAINED THROUGH THE ALUM CRACKING THUS EFFECTED.
Inventors
- 👤 Giovanni Bonelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:52
CPC Classifications
C; C01; C01D; C01D5/00; C01D5/008; C01F; C01F7/00; C01F7/02; C01F7/30; C01F7/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |