US3694356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abatement of water pollution
Assignee: USA
•
Filing: 1971-03-17
•
Granted: 1972-09-26
•
Expires: 1991-03-17
Abstract
Abstract A PROCESS FOR THE PURIFICATION OF EFFLUENT FROM SEWAGE TREATMENT COMBINED WITH THE SIMULTANEOUS PURIFICATION OF ACIDIC MINE DRAINAGE BY COMBINING THE TWO STREAMS IN SUITABLE PROPORTIONS SO AS TO PRECIPITATE WATER INSOLUBLE IRON PHOSPHATES.
Inventors
- 👤 Johannes M A Vander Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:28
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/919
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |