US3799872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil-water separation
Assignee: Howe Baker Engineers LLC
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Filing: 1973-01-16
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Granted: 1974-03-26
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Expires: 1993-01-16
Abstract
Abstract A METHOD FOR SEPARATING THE OIL FRACTION FROM THE AQUEOUS FRACTION IN AN OIL-CONTAINING AQUEOUS STREAM BY CONTACTING THE STREAM WITH 5 TO 20% BY VOLUME OF A LOW BOILING HYDROCARBON LIQUID AND 5 TO 100 P.P.M. BY VOLUME OF A LIQUID SURFACTANT COMPOSITION.
Inventors
- 👤 R Hargis
- 👤 D Bartley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:40
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/26; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; B01D17/06
Claims Analysis
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |