Patent US3689406A successfully refreshed from Google Patents.
US3689406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for separating oils from water
Assignee: Individual
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Filing: 1970-12-01
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Granted: 1972-09-05
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Expires: 1990-12-01
Abstract
Abstract OIL IS REMOVED FROM WATER, E.G., WASTE WATER, BY MEANS OF A FIBROUS FILTER COMPOSED ESSENTIALLY OF A HYDROPHILIC CELLULOSE MATERIAL SUCH AS REGENERATED CELLULOSE, MERCERIZED CELLULOSE AND ACETYLATED CELLULOSE.
Inventors
- 👤 Masanori Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:40
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/08; B01D17/10; B01J; B01J20/00; B01J20/22
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |