Patent US4602650A successfully refreshed from Google Patents.
US3733265A
Expired / Lapsed
US
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Cross-flow filtration process for removal of total organic carbon and phosphates from aqueous sewage effluents
Assignee: United States Atomic Energy Commission
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Filing: 1971-11-22
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Granted: 1973-05-15
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Expires: 1991-11-22
Abstract
Abstract AN IMPROVED METHOD IS PROVIDED FOR REMOVING THE ORGANIC AND PHOSPHATE CONTENT OF AN AQUEOUS FEED WHICH COMPRISES ADDING AN EFFECTIVE AMOUNT OF A SALT WHICH HYDROLYZES TO A HYDROUS OXIDE TO SAID FEED AND THEN PASSING THE THUS-TREATED FEED TANGENTIALLY PAST ONE FACE OF A POROUS SUBSTRATE AT A PRESSURE SUFFICIENT TO PRODUCE A CLARIFIED FILTRATE ON AN OPPOSITE FACE OF SAID SUBSTRATE.
Inventors
- 👤 K Kraus
- 👤 H Mahlman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:57
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/02; B01D61/025; C; C02; C02F; C02F1/00; C02F1/28; C02F1/288; C02F1/52; C02F1/5236; B01D2311/00; B01D2311/04; B01D2315/00; B01D2315/10
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |