US3681238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for stabilizing producer well water
Assignee: Envirotech Corp
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Filing: 1971-01-11
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Granted: 1972-08-01
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Expires: 1991-01-11
Abstract
Abstract PRODUCER WELL WATER INTENDED FOR USE IN THE SECONDARY RECOVERY OF OIL BY WATER FLOODING IS STABILIZED BY AERATION, TREATMENT WITH A COAGULANT AND FILTRATION THROUGH A PRECOATED VACUUM FILTER.
Inventors
- 👤 Robert C Emmett Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:35
CPC Classifications
C; C02; C02F; C02F9/00
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |