US2997430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying sewage-water
Assignee: Elektrokemisk AS
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Filing: 1958-06-20
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Granted: 1961-08-22
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Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
- 👤 Foyn Johan Ernst Fredrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:59
CPC Classifications
C; C05; C05B; C05B7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF SEPARATING FROM SEWAGE WATER PHOSPHATES AVAILABLE FOR USE AS FERTILIZER WHICH COMPRISES STRAINING SEWAGE TO REMOVE SOLID MATERIAL, MIXING THE LIQUID RESIDUE WITH AT LEAST 5% BY VOLUME OF SEA WATER, PASSING SUCH MIXTURE THROUGH THE CATHODE COMPARTMENT OF A DIALYSIS CELL WHICH ALSO HAS SEA WATER IN THE ANODE COMPARTMENT, RETAINING THE SEWAGE WATER MIXTURE IN THE CATHODE COMPARTMENT UNTIL THE SOLUTION THEREIN REACHES A PH OF AT LEAST 9.5 WHEREBY COMPOUNDS COMPRISING MGNH4PO4 ARE PRECIPITATED AND CAUSED TO RISE TO THE SURFACE OF THE SEA WATER-SEWAGE WATER RESIDUE AND SEPARATING SUCH MATERIAL FROM THE SURFACE OF THE LIQUID.
Claim 2
Independent Claim
103 words
THE METHOD OF SEPARATING FROM SEWAGE WATER PHOSPHATES AVAILABLE FOR USE AS FERTILIZER WHICH COMPRISES STRAINING SEWAGE TO REMOVE SOLID MATERIAL, MIXING THE LIQUID RESIDUE WITH AT LEAST 5% BY VOLUME OF SEA WATER, PASSING SUCH MIXTURE THROUGH THE CATHODE COMPARTMENT OF A DIALYSIS CELL WHICH ALSO HAS SEA WATER IN THE ANODE COMPARTMENT, RETAINING THE SEWAGE WATER MIXTURE IN THE CATHODE COMPARTMENT UNTIL THE SOLUTION THEREIN REACHES A PH OF AT LEAST 9.5 WHEREBY COMPOUNDS COMPRISING MGNH4PO4 ARE PRECIPITATED AND CAUSED TO RISE TO THE SURFACE OF THE SEA WATER-SEWAGE WATER RESIDUE AND SEPARATING SUCH MATERIAL FROM THE SURFACE OF THE LIQUID.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |