US3736253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for removing mercury from waste water
Assignee: Sobin Chlor Alkali Inc
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Filing: 1972-04-10
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Granted: 1973-05-29
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Expires: 1992-04-10
Abstract
Abstract A METHOD FOR REMOVING MERCURY FROM WATER CONTAMINATED WITH MERCURY COMPRISING CONTACTING WATER CONTAINING METALLIC MERCURY WITH FINELY DIVIDED ANTHRACITE COAL. THE MERCURY LADEN WATER CAN BE FIRST TREATED WITH ODIUM BOROHYDRIDE TO REDUCE DISSOLVED MERCURY TO THE METALLIC FORM. THE WATER TREATES WITH REDUCING AGENT, IS FILTERED THROUGH A PRESSURE LEAF FILTER COATED WITH A FILTER ACID, CONTRACTED WITH ANTHRACITE COAL AND CONTACTED WITH CHELATING RESIN.
Inventors
- 👤 Angelis P De
- 👤 A Morris
- 👤 A Macmillan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:14
CPC Classifications
C; C02; C02F; C02F9/00; C02F1/00; C02F1/28; C02F1/283; C02F2101/00; C02F2101/10; C02F2101/20
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) | 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 |