US3725264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste water treatment process
Assignee: Signal Oil and Gas Co
•
Filing: 1972-03-13
•
Granted: 1973-04-03
•
Expires: 1992-03-13
Abstract
Abstract A METHOD FOR REMOVING RESIDUAL OIL AND DISSOLVED SULFIDES FROM OIL PRODUCTION WASTE WATERS PRIOR TO DISPOSAL OF THE WASTE WATER INTO THE OCEAN, BY THE INJECTION OF CONTROLLED AMOUNTS OF OXYGEN, AIR, AND A CATALYST TO OXIDIZE THE SULFIDES TO FREE SULFUR INTO THE WASTE WATER. THE MIXTURE IS PUMPED UNDER PRESSURE INTO A FLOTATION CELL OR TANK WHERE THE PRESSURE IS RELEASED AND THE SULFUR AND OIL ARE SEPARATED FROM THE WATER BY FLOTATION.
Inventors
- 👤 D Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24; C02F1/72; C02F1/725
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |