US3576738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purification of oil production waste water
Assignee: Phillips Petroleum Co
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Filing: 1969-08-04
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Granted: 1971-04-27
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Expires: 1989-08-04
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 AIR AND SOLUBLE NICKEL CATALYST INTO THE WASTE WATER. THE MIXTURE IS PUMPED UNDER PRESSURE INTO A FLOTATION CELL OR TANK WHERE THE PRESSURE IS RELEASED AND THE AIR EFFECTS OIL SEPARATION AND OXIDATION OF THE DISSOLVED HYDROGEN SULFIDE.
Inventors
- 👤 John Duffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:52
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |