US3729410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
De-oiling of polluted waters
Assignee: Bpifrance Financement SA
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Filing: 1971-03-03
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Granted: 1973-04-24
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Expires: 1991-03-03
Abstract
Abstract A PROCESS FOR DE-OILING POLLUTED WATERS WHICH COMPRISES CONTACTING THE OIL-CONTAINING WATER WITH AN OLEOPHILIC RESIN HAVING A HIGH SURFACE AREA, FOR EXAMPLE, IN THE FORM OF A POWDER OR SMALL SPHERULES OR GRANULES, AND REMOVING THE TREATED WATER FROM THE RESIN, AFTER SEVERAL STAGES AS NECESSARY IF A PARTICULAR DEGREE OF DEOILING IS DESIRED. THE OLEPHILIC RESIN CAN BE AN ION EXCHANGE RESIN, THE OLEOPHILIC PROPERTIES ARE IMPARTED THERETO BY ORGANIC IONS FIXED THEREON. ACCORDINGLY, AN ION EXCHANGE OPERATION CAN BE CONDUCTED CONCURRENTLY WITH THE DE-OILING PROCESS, IF DESIRED.
Inventors
- 👤 A Abadie
- 👤 A Gazost
- 👤 H Roques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:56
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/04; B01D17/045; B01J; B01J47/00; B01J47/016
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |