US3835040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cross-flow filtration process
Assignee: United States Atomic Energy Commission
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Filing: 1973-04-04
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Granted: 1974-09-10
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Expires: 1993-04-04
Abstract
Abstract A PROCESS IS PROVIDED FOR REMOVING THE ORGANIC AND PHOSPHATE CONTENT OF AN AQUEOUS FEED CONTAINING SAME WHICH COMPRISES ADDING AN EFFECTIVE AMOUNT OF AT LEAST ONE ADDITIVE SELECTED FROM THE GROUP CONSISTING ESSENTIALLY OF A SALT WHICH HYDROLYZES TO A HYDROUS OXIDE, ADJUSTING THE PH OF SAID FEED TO A VALUE BELOW 3.5, DIGESTING SAID FEED IN AIR AT A TEMPERATURE IN THE RANGE 32* TO 100*F., INCREASING THE PH OF THE DIGESTED FEED TO A VALUE IN THE RANGE 5.5 TO 7.5, AND THEN FILTERING THE DIGESTED FEED.
Inventors
- 👤 H Mahlman
- 👤 W Sisson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:04
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/14; B01D37/00; B01D37/02; C; C02; C02F; C02F1/00; C02F1/52; C02F1/5236
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |