US3736239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutralization of metal containing wastes
Assignee: United States Department of the Interior
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Filing: 1971-03-18
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Granted: 1973-05-29
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Expires: 1991-03-18
Abstract
Abstract A CYANIDE AND METAL-CONTAINING LIQUID WASTE STREAM IS TREATED BY ADDITION OF A SECOND LIQUID WASTE STREAM WHICH CONTAINS ACIDS AND DISSOLVED METALS. FREE CYANIDE IONS ARE QUANTITATIVELY REMOVED FROM THE WASTES BY PRECIPITATION AS METAL CYANIDES AT NEUTRAL TO SILGHTLY ACID CONDITIONS.
Inventors
- 👤 L George
- 👤 L Ballard
- 👤 V Feeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:10
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; C02F1/66; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18; C02F2101/20; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/904; Y10S210/911; Y10S210/912; Y10S210/913; Y10S210/918; Y10S210/919
Claims Analysis
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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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |