Patent US5373099A successfully refreshed from Google Patents.
Patent US3141733A successfully refreshed from Google Patents.
US3141733A
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Removal of iron from aqueous aluminum sulfate solution
Assignee: Wyeth Holdings LLC
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Filing: 1961-07-27
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Granted: 1964-07-21
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Expires: 1981-07-27
Abstract
No abstract record available.
Inventors
- 👤 Broisman Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:31
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/68; C01F7/74; C01F7/746; C01F7/748
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
PROCESS FOR DECREASING THE IRON CONTENT OF THE CRUDE AQUEOUS ALUMINUM SULFATE SOLUTION PREPARED BY DIGESTION OF A FERROALUMINUM ORE, WHICH COMPRISES OXIDIZING SUBSTANTIALLY ALL OF THE FERROUS SULFATE IN SAID SOLUTION TO FERRIC SULFATE BY THE ACTION OF A PEROXIDE, ADDING YELLOW PRUSSIATE OF SODA AS AN AQUEOUS SOLUTION AND THEREBY CONVERTING AT LEAST PART OF THE FERRIC SULFATE IN SAID SOLUTION TO PRUSSIAN BLUE PARTICLES OF SUBSTANTIALLY NON-FILTERABLE DIMENSIONS, ADDING A POLYACRYLAMIDE FLOCCULENT WHEREBY SUBSTANTIALLY ALL OF SAID PRUSSIAN BLUE IS AGGREGATED TO FLOCS OF FILTERABLE DIMENSIONS, AND FILTERING SAID FLOCCULATED PRUSSIAN BLUE FROM SAID ALUM SOLUTION.
Claim 2
Dependent Claim
99 words
PROCESS FOR DECREASING THE IRON CONTENT OF THE CRUDE AQUEOUS ALUMINUM SULFATE SOLUTION PREPARED BY DIGESTION OF A FERROALUMINUM ORE, WHICH COMPRISES OXIDIZING SUBSTANTIALLY ALL OF THE FERROUS SULFATE IN SAID SOLUTION TO FERRIC SULFATE BY THE ACTION OF A PEROXIDE, ADDING YELLOW PRUSSIATE OF SODA AS AN AQUEOUS SOLUTION AND THEREBY CONVERTING AT LEAST PART OF THE FERRIC SULFATE IN SAID SOLUTION TO PRUSSIAN BLUE PARTICLES OF SUBSTANTIALLY NON-FILTERABLE DIMENSIONS, ADDING A POLYACRYLAMIDE FLOCCULENT WHEREBY SUBSTANTIALLY ALL OF SAID PRUSSIAN BLUE IS AGGREGATED TO FLOCS OF FILTERABLE DIMENSIONS, AND FILTERING SAID FLOCCULATED PRUSSIAN BLUE FROM SAID ALUM SOLUTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |