US3586477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of ferric iron from aqueous solutions of aluminum salts
Assignee: Arthur D Little Inc
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Filing: 1968-10-16
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Granted: 1971-06-22
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Expires: 1988-10-16
Abstract
Abstract AN ION-EXCHANGE LIQUID AND METHOD OF USING IT FOR EXTRACTION OF RELATIVELY SMALL AMOUNTS OF FERRIC IRON FROM AQUEOUS SOLUTIONS OF ALUMINUM SLATS OF NITRIC, SULFURIC OR HYDROCHLORIC ACID. THE ION-EXCHANGE LIQUID COMPRISES A WATER-IMMISCIBLE ORGANIC LIQUID CARRIER AND A MIXTURE OF DI(2-ETHYL-HEXYL) HYDROGEN PHOSPHATE AND TRIBUTYL PHOSPHATE OR A PRIMARY AMINE. WHEN IT IS BROUGHT INTO DIRECT CONTACT WITH THE AQUEOUS SOLUTION, THE FERRIC IRON IONS ARE TRANSFERRED TO THE ION-EXCHANGE LIQUID FROM THE AQUEOUS SOLUTION TO BE PURIFIED.
Inventors
- 👤 Harold William Flood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/56; C01F7/62; C01F7/02; C01F7/20; C01F7/66; C01F7/68; C01F7/74; C01F7/746; C01F7/748; C01G; C01G49/00; C01G49/0009; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/40; C22B3/408; C22B3/409; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
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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 |