Patent US3690827A successfully refreshed from Google Patents.
US3690827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange process for aluminum values
Assignee: DONALD E GARRETT
•
Filing: 1970-06-04
•
Granted: 1972-09-12
•
Expires: 1990-06-04
Abstract
Abstract ALUMINUM PHOSPHATE ORE IS SOLUBILIZED BY A CATION EXCHANGE RESIN TO PRODUCE A RESIN SLURRY AND PHOSPHORIC ACID FILTRATE. THE RESIN IS TREATED WITH HCL TO REGENERATE THE RESIN AND PRODUCE AN ALUMINUM CHLORIDE SOLUTION WHICH IS THEN EVAPORATED AND HYDROLIZED TO ALUMINUM OXIDE WITH THE EVOLVED HCL BEING RECYCLED TO THE RESIN REGENERATION STEP. WHEN IRON IS PRESENT, THE IRON IS SEPARATED FROM THE CHLORIDE SOLUTION BY THE ADDITION OF ALUMINA TO ADJUST THE PH OF THE SOLUTION TO A VALUE OF FROM ABOUT 2 TO 2.5. THIS CAUSES THE IRON TO PRECIPITATE AS FERRIC HYDROXIDE.
Inventors
- 👤 Donald E Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:48
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/185; C01F; C01F7/00; C01F7/48; C01F7/56
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |