US3728257A
Expired / Lapsed
US
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Methods and means for removing heavy metal ions from liquids containing such ions
Assignee: BILLINGSFORS LANGED AB
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Filing: 1971-02-19
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Granted: 1973-04-17
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Expires: 1991-02-19
Abstract
Abstract THE INVENTION RELATES TO METHODS AND MEANS FOR EFFICIENTLY REMOVING HEAVY METAL IONS FROM AQUEOUS OR OTHER LIQUIDS FOR THE PURPOSE OF PURIFYING SAID LIQUIDS AND-OR RECOVERING SAID METALS, SAID LIQUIDS ARE PASSED THROUGH AN ABSORBENT BED WHICH CONTAINS A SOLID ABSORBENT OF CARBON MATERIAL HAVING AT LEAST ONE THIOL COMPOUND PRE-ADSORBED THERETO, SAID BED HAVING BEEN PREPARED BY PASSING A LIQUID OR GAS CONTAINING OR CONSISTING OF THE THIOL COMPOUND THROUGH SAID CARBON MATERIAL. THE INVENTION ALSO RELATES TO A PROCESS FOR PRODUCING SAID ABSORBENT BED.
Inventors
- 👤 K Fuxelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:17
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/02; B01J20/20; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3248; B01J20/3253; B01J47/00; B01J47/016; C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01B32/348; C01B32/354; C01B32/372; C02; C02F; C02F1/00; C02F1/28; C02F1/288; B01J2220/00; B01J2220/50; B01J2220/56; B01J2220/58; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912; Y10S210/913; Y10S423/00; Y10S423/09; Y10S423/14
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |