US3218252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the bacteriological oxidation of ferrous salts in acidic solution
Assignee: Coal Industry Patents Ltd
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Filing: 1963-08-27
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Granted: 1965-11-16
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Expires: 1983-08-27
Abstract
No abstract record available.
Inventors
- 👤 Glover Harold Gordon
- 👤 Hunt Jack Walesby
- 👤 Kenyon William George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:39
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/085; C02F3/12; C02F3/1205; C02F3/1215; C02F3/34; C12; C12P; C12P3/00; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/17; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/832
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
AN ACTIVATED SLUDGE PROCESS FOR THEBACTERIOLOGICAL OXIDATION OF FERROUS SALTS IN ACIDIC SOLUTION, COMPRISING THE STEPS OF SUBJECTING THE SOLUTION TO THE ACTION OF AN ACTIVE SLUDGE COMPRISING AUTOTROPHIC IRON OXIDISING BACTERIA CARRIED ON PARTICLES OF SOLID MATERIAL IN A LIQUID SUSPENSION, BY PASSING THE SOLUTION THROUGH AT LEAST TWO CONTAINERS IN SERIES, IN WHICH CONTAINERS SAID ACTIVE SLUDGE IS MAINTAINED; RECOVERING BY SEDIMENTATION SLUDGE APPEARING
Claim 2
Dependent Claim
66 words
AN ACTIVATED SLUDGE PROCESS FOR THEBACTERIOLOGICAL OXIDATION OF FERROUS SALTS IN ACIDIC SOLUTION, COMPRISING THE STEPS OF SUBJECTING THE SOLUTION TO THE ACTION OF AN ACTIVE SLUDGE COMPRISING AUTOTROPHIC IRON OXIDISING BACTERIA CARRIED ON PARTICLES OF SOLID MATERIAL IN A LIQUID SUSPENSION, BY PASSING THE SOLUTION THROUGH AT LEAST TWO CONTAINERS IN SERIES, IN WHICH CONTAINERS SAID ACTIVE SLUDGE IS MAINTAINED; RECOVERING BY SEDIMENTATION SLUDGE APPEARING
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-15 | 1969-05-17 | 1969-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-15 | 1973-05-17 | 1973-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-15 | 1977-05-17 | 1977-11-16 | $7700.00 | Window Closed / Lapsed |