US3781201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for separating oil from a mixture of oil and waste water from an offshore rig
Assignee: Individual
•
Filing: 1972-01-24
•
Granted: 1973-12-25
•
Expires: 1992-01-24
Abstract
Abstract THE PRESENT DISCLOSURE IS DIRECTED TO SEPARATING OIL FROM A MIXTURE OF OIL AND WASTE WATER ON OFFSHORE RIGS WHERE THE WATER CANNOT MERELY BE ALLOWED TO WASH OVERBOARD CONTAINING OIL WHICH POLLUTES THE ENVIRONMENT AND ENDANGERS MARINE LIFE. THE MIXTURE OF OIL AND WATER IS FIRST PASSED THROUGH A PRIMARY SKIMMER TANK WHERE OIL THAT QUICKLY SEPARATES FROM WATER IS SKIMMED OFF INTO A BLOW CASE AND WATER FROM THE BOTTOM OF THE SKIMMER TANK IS FED TO A MIXING TANK WHERE GYPSUM AND LIME ARE ADDED AND THE GYPSUM-OIL AND EXCESS GYPSUM AND OTHER POLLUTANTS ARE MECHANICALLY SEPARATED FROM THE WATER.
Inventors
- 👤 C Carmichael
- 👤 A Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:23
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/0208; B01D17/04; B01D17/047; Y; Y10; Y10S; Y10S210/00; Y10S210/918; Y10S210/922; Y10S210/924
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |