US3084029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of phosphorus from sludge
Assignee: Tennessee Valley Authority
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Filing: 1961-06-19
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Granted: 1963-04-02
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Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 James C Barber
- 👤 George H Megar
- 👤 Thomas S Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:16
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/01; C01B25/02; C02; C02F; C02F1/00; C02F1/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE METHOD OF PRODUCING PHOSPHORUS BY SMELTING PHOSPHATE ROCK WITH A REDUCING AGENT IN THE PRESENCE OF SILICA AND THEREAFTER CONDENSING, COLLECTING, AND RECOVERING THE RESULTING PHOSPHORUS VAPOR UNDER WATER AND SEPARATING THE ACCUMULATED PHOSPHORUS-BEARING SLUDGE FROM THE RELATIVELY PURE ELEMENTAL PHOSPHORUS RESULTING FROM THE CONDENSATION OF THE PHOSPHORUS VAPOR, THE IMPROVEMENT WHICH COMPRISES INTRODUCING INTO A VESSEL SAID ACCUMULATED PHOSPHORUS-BEARING SLUDGE; APPLYING CENTRIFUGAL FORCES TO SAID SLUDGE IN SAID VESSEL; REMOVING FROM SAID VESSEL AS OVERFLOW A WATER SLURRY CONTAINING SOLIDS AND CARBONACEOUS MATERIALS; AND RECOVERING FROM SAID VESSEL AS UNDERFLOW LIQUID PHOSPHORUS.
Claim 2
Dependent Claim
95 words
IN THE METHOD OF PRODUCING PHOSPHORUS BY SMELTING PHOSPHATE ROCK WITH A REDUCING AGENT IN THE PRESENCE OF SILICA AND THEREAFTER CONDENSING, COLLECTING, AND RECOVERING THE RESULTING PHOSPHORUS VAPOR UNDER WATER AND SEPARATING THE ACCUMULATED PHOSPHORUS-BEARING SLUDGE FROM THE RELATIVELY PURE ELEMENTAL PHOSPHORUS RESULTING FROM THE CONDENSATION OF THE PHOSPHORUS VAPOR, THE IMPROVEMENT WHICH COMPRISES INTRODUCING INTO A VESSEL SAID ACCUMULATED PHOSPHORUS-BEARING SLUDGE; APPLYING CENTRIFUGAL FORCES TO SAID SLUDGE IN SAID VESSEL; REMOVING FROM SAID VESSEL AS OVERFLOW A WATER SLURRY CONTAINING SOLIDS AND CARBONACEOUS MATERIALS; AND RECOVERING FROM SAID VESSEL AS UNDERFLOW LIQUID PHOSPHORUS.
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) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |