Patent US2536402A successfully refreshed from Google Patents.
Patent US3798160A successfully refreshed from Google Patents.
US3798160A
Expired / Lapsed
US
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Treatment of aluminum waste liquors
Assignee: Cyprus Amax Minerals Co
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Filing: 1971-03-29
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Granted: 1974-03-19
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Expires: 1991-03-29
Abstract
Abstract METHOD OF RECOVERING ALUMINUM VALUES FROM ALUMINUM WASTE LIQUOR WHICH COMPRISES ADJUSTING THE PH OF THE LIQUOR TO 6 8.5, THUS CAUSING PRECIPITATION OF ALUMINUM HYDROXIDE, ADDING SUFFICIENT POLYACRYLAMIDE RESIN SOLUTION TO PRODUCE A CONCENTRATION OF 1 TO 5 P.P.M. OF RESIN IN THE LIQUOR, ALLOWING THE ALUMINUM HYDROXIDE PRECIPITATE TO SETTLE IN A THICKENER, WITHDRAWING THE SUPERNATANT LIQUID FROM SAID THICKENER, REMOVING THE PRECIPITATE FROM SAID THICKENER BY FILTRATION, RECYCLING THE FILTRATE TO THE THICKENER, AND COLLECTING THE ALUMINUM HYDROXIDE FILTER CAKE FROM THE FILTER.
Inventors
- 👤 C Huffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:09
CPC Classifications
C; C02; C02F; C02F9/00; C02F1/00; C02F1/52; C02F1/54; C22; C22B; C22B21/00; C22B21/0015; C22B21/0023; C02F2101/00; C02F2101/10; C02F2101/20; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |