US2773736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of phosphate rock to recover phosphorus, fluorine, calcium, and uranium
Assignee: SMITH DOUGLASS CO Inc
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Filing: 1952-08-08
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Granted: 1956-12-11
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Expires: 1972-08-08
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:40
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/003; C01B25/01; C01B25/10; C01B7/00; C01B7/19; C01B7/191; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0213
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
THE METHOD OF RECOVERING VALUES FROM A NATURAL PHOSPHATIC MATERIAL CONTAINING RECOVERABLE AMOUNTS OF PHOSPHORUS, FLUORINE AND CALCIUM WHICH COMPRISES PREPARING AN INTIMATE MIXTURE CONSISTING ESSENTIALLY OF SAID MATERIAL AND AT LEAST 10% BY WEIGHT OF A CARBONACEOUS MATERIAL, SUBJECTING SAID MIXTURE TO HEAT-TREATMENT FOR A PERIOD NOT EXCEEDING 90 MINUTES AT A TEMPERATURE WITHIN THE RANGE OF 2000 TO ABOUT 2400* F. IN A CHLORINE-CONTAINING ATMOSPHERE SELECTED FROM THE CLASS CONSISTING OF HYDROGEN CHLORIDE AND AMMONIUM CHLORIDE IN WHICH CHLORINE IS PRESENT IN EXCESS OF THE AMOUNT THEORETICALLY REQUIRED TO CONVERT ALL OF THE CALCIUM IN THE PHOSPHATIC MATERIAL TO CALCIUM CHLORIDE, AND SUBJECTING THE GASEOUS REACTION PRODUCT OF THE HEAT-TREATMENT TO SELECTIVE CONDENSATION IN WHICH AT LEAST TWO CONDENSATES ARE OBTAINED
Claim 2
Independent Claim
123 words
THE METHOD OF RECOVERING VALUES FROM A NATURAL PHOSPHATIC MATERIAL CONTAINING RECOVERABLE AMOUNTS OF PHOSPHORUS, FLUORINE AND CALCIUM WHICH COMPRISES PREPARING AN INTIMATE MIXTURE CONSISTING ESSENTIALLY OF SAID MATERIAL AND AT LEAST 10% BY WEIGHT OF A CARBONACEOUS MATERIAL, SUBJECTING SAID MIXTURE TO HEAT-TREATMENT FOR A PERIOD NOT EXCEEDING 90 MINUTES AT A TEMPERATURE WITHIN THE RANGE OF 2000 TO ABOUT 2400* F. IN A CHLORINE-CONTAINING ATMOSPHERE SELECTED FROM THE CLASS CONSISTING OF HYDROGEN CHLORIDE AND AMMONIUM CHLORIDE IN WHICH CHLORINE IS PRESENT IN EXCESS OF THE AMOUNT THEORETICALLY REQUIRED TO CONVERT ALL OF THE CALCIUM IN THE PHOSPHATIC MATERIAL TO CALCIUM CHLORIDE, AND SUBJECTING THE GASEOUS REACTION PRODUCT OF THE HEAT-TREATMENT TO SELECTIVE CONDENSATION IN WHICH AT LEAST TWO CONDENSATES ARE OBTAINED
Claim 3
Dependent Claim
25 words
THE METHOD OF CLAIM 1 IN WHICH THE MOLTEN CALCIUM CHLORIDE IS SEPARATED FROM THE UNFUSED SOLID MATTER OF THE NON-VOLATILE RESIDUE OF THE HEAT-TREATMENT.
Claim 4
Dependent Claim
34 words
THE METHOD OF CLAIM 2 IN WHICH THE NATURAL PHOSPHATIC MATERIAL ADDITIONALLY CONTAINS A RECOVERABLE AMOUNT OF URANIUM, AND RECOVERING SUCH URANIUM WITH THE CALCIUM CHLORIDE SEPARATED FROM THE NON-VOLATILE RESIDUE OF THE HEAT-TREATMENT.
References Cited (Backward Citations)
US2531046A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |