US3748124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for simultaneous reduction of hexavalent chromium and cementation of copper
Assignee: General Electric Co
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Filing: 1971-01-11
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Granted: 1973-07-24
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Expires: 1991-01-11
Abstract
Abstract A METHOD AND APPARATUS FOR SIMULTANEOUSLY REDUCING HEXAVALENT CHROMIUM AND ACHIEVING THE CEMENTATION OF COPPER FROM A SOLUTION CONTAINING SOLUBLE COPPER COMPOUNDS AND HEXAVALENT CHROMIUM COMPOUNDS, INCLUDING ADDING SULFURIC ACID TO THE SOLUTION IN SUFFICIENT QUANTITIES TO MAINTAIN A PH IN THE RANGE OF ABOUT 1.5 TO ABOUT 3.0 AND INTRODUCING THE SOLUTION INTO A ROTATABLE INCLINED CHAMBER HAVING IRON-CONTAINING OBJECTS THEREIN TO ACCOMPLISH BOTH THE REDUCTION OF THE HEXAVALENT CHROMIUM AND THE CEMENTATION OF A SUBSTANTIAL PORTION OF THE COPPER. CEMENTED COPPER IS SEPARATED FROM THE TREATED SOLUTION AND THE SOLUTION MAY THEN BE REPROCESSED FOR FURTHER COPPER REMOVAL.
Inventors
- 👤 O Case
- 👤 R Jones
- 👤 R Spellman
- 👤 J Archambault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:14
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C22; C22B; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; C22B15/0091; C22B3/00; C22B3/20; C22B3/44; C22B3/46; C22B34/00; C22B34/30; C22B34/32; C02F2101/00; C02F2101/10; C02F2101/20; C02F2101/22; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |