Patent US3814685A successfully refreshed from Google Patents.
US3814685A
Expired / Lapsed
US
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Removal of mercury from mercury cathode sludge
Assignee: Environmental Protection Agency
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Filing: 1973-04-27
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Granted: 1974-06-04
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Expires: 1993-04-27
Abstract
Abstract MERCURY IS RECOVERED FROM MERCURY CATHODE SLUDGE BY TREATING THE SLUDGE WITH ACID AND THEN ROASTING. THE MERCURY CONTENT OF THE RESIDUE IS REDUCED SIGNIFICANTLY LOWER THAN WHEN THE ACID TREATMENT STEP IS OMITTED.
Inventors
- 👤 D Rachor
- 👤 R Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:20
CPC Classifications
C; C02; C02F; C02F9/00; C22; C22B; C22B43/00; C22B7/00; C22B7/001; C22B7/006; C22B7/007; 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)
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |