US2995436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defluorination of phosphate rock
Assignee: SMITH DOUGLASS CO Inc
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Filing: 1957-11-29
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Granted: 1961-08-08
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Expires: 1977-11-29
Abstract
No abstract record available.
Inventors
- 👤 Clinton A Hollingsworth
- 👤 William A Kirkland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:31
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/02; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN THE METHOD OF PRODUCING A DEFLUORINATED PHOSPHATE PRODUCT HAVING HIGH AVAILABILITY IN WHICH A PHOSPHATE MATERIAL WITH A SILICA CONTENT OF FROM 2 TO 6% IS CALCINED IN THE PRESENCE OF WATER VAPOR AND WITHOUT FUSION AT A TEMPERATURE OF AT LEAST 2300*F. AND THE HOT CALCINE IS QUENCHED TO A TEMPERATURE BELOW 2000*F., THE IMPROVEMENT WHICH COMPROSES MIXING AN UNGROUND PHOSPHATE ROCK CONCENTRATE WITH SODA ASH AND AN AQEUOUS SOLUTION OF PHOSPHORIC ACID IN THE PRESENCE OF FROM 10 TO 20% BY WEIGHT OF WATER, THE AMOUNT OF SODA ASH (CALCULATED AS NA2O) AND THE AMOUNT OF PHOSPHORIC ACID (CALCULATED AS P2O5) INCLUDED IN THE MOIST MIXTURE OF CONCENTRATE, SODA ASH AND ACID BEING WITHIN THE RANGES OF 5 TO 9% AND 7 TO 11%, RESPECTIVELY, BASED ON THE DRY WEIGHT OF THE MIXTURE, FORMING THE MOIST MIXTURE OF CONCENTRATE, SODA ASH AND ACID INTO POROUS NODULES, AND SUBJECTING THE NODULES TO CALCINATION OF THE CHARACTER HEREINBEFORE RECITED.
Claim 2
Dependent Claim
160 words
IN THE METHOD OF PRODUCING A DEFLUORINATED PHOSPHATE PRODUCT HAVING HIGH AVAILABILITY IN WHICH A PHOSPHATE MATERIAL WITH A SILICA CONTENT OF FROM 2 TO 6% IS CALCINED IN THE PRESENCE OF WATER VAPOR AND WITHOUT FUSION AT A TEMPERATURE OF AT LEAST 2300*F. AND THE HOT CALCINE IS QUENCHED TO A TEMPERATURE BELOW 2000*F., THE IMPROVEMENT WHICH COMPROSES MIXING AN UNGROUND PHOSPHATE ROCK CONCENTRATE WITH SODA ASH AND AN AQEUOUS SOLUTION OF PHOSPHORIC ACID IN THE PRESENCE OF FROM 10 TO 20% BY WEIGHT OF WATER, THE AMOUNT OF SODA ASH (CALCULATED AS NA2O) AND THE AMOUNT OF PHOSPHORIC ACID (CALCULATED AS P2O5) INCLUDED IN THE MOIST MIXTURE OF CONCENTRATE, SODA ASH AND ACID BEING WITHIN THE RANGES OF 5 TO 9% AND 7 TO 11%, RESPECTIVELY, BASED ON THE DRY WEIGHT OF THE MIXTURE, FORMING THE MOIST MIXTURE OF CONCENTRATE, SODA ASH AND ACID INTO POROUS NODULES, AND SUBJECTING THE NODULES TO CALCINATION OF THE CHARACTER HEREINBEFORE RECITED.
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) | 1964-08-07 | 1965-02-06 | 1965-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-07 | 1969-02-06 | 1969-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-07 | 1973-02-06 | 1973-08-08 | $7700.00 | Window Closed / Lapsed |