US3078156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for eliminating fluorine from phosphate rocks
Assignee: Individual
•
Filing: 1957-10-16
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Granted: 1963-02-19
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Expires: 1977-10-16
Abstract
No abstract record available.
Inventors
- 👤 Yamaguchi Taro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:14
CPC Classifications
C; C05; C05B; C05B7/00; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN A METHOD OF DEFLUORINATING PHOSPHATE ROCK CONSISTING MAINLY OF TRICALCIUM PHOSPHATE OF APATITE STRUCTURE BY HEATING THE ROCK IN THE PRESENCE OF A SODIUM SALT, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE ROCK WITH A SODIUM PHOSPHATE IN SUCH QUANTITY AS TO ESTABLISH A CONCENTRATION OF 1 TO 3 MOLS OF SODIUM PER MOL OF DIATOMIC FLUORINE IN THE ROCK, THERE BEING 1 TO 2.4 MOLS OF SODIUM PHOSPHATE PER MOL OF CALCIUM IN THE ROCK OTHER THAN THE CALCIUM WHICH IS PRESENT AS TRICALCIUM PHOSPHATE, THEREAFTER SINTERING THE MIXTURE IN THE PRESENCE OF WATER VAPOR, THE PHOSPHATE OF THE SODIUM PHOSPHATE GREATLY REDUCING THE QUANTITY OF SODIUM SALT NEEDED FOR DEFLUORINATION, AND RECOVERING FROM THE PROCESS AS DEFLUORINATED PHOSPHATE ROCK.
Claim 2
Dependent Claim
121 words
IN A METHOD OF DEFLUORINATING PHOSPHATE ROCK CONSISTING MAINLY OF TRICALCIUM PHOSPHATE OF APATITE STRUCTURE BY HEATING THE ROCK IN THE PRESENCE OF A SODIUM SALT, THE IMPROVEMENT WHICH COMPRISES CONTACTING THE ROCK WITH A SODIUM PHOSPHATE IN SUCH QUANTITY AS TO ESTABLISH A CONCENTRATION OF 1 TO 3 MOLS OF SODIUM PER MOL OF DIATOMIC FLUORINE IN THE ROCK, THERE BEING 1 TO 2.4 MOLS OF SODIUM PHOSPHATE PER MOL OF CALCIUM IN THE ROCK OTHER THAN THE CALCIUM WHICH IS PRESENT AS TRICALCIUM PHOSPHATE, THEREAFTER SINTERING THE MIXTURE IN THE PRESENCE OF WATER VAPOR, THE PHOSPHATE OF THE SODIUM PHOSPHATE GREATLY REDUCING THE QUANTITY OF SODIUM SALT NEEDED FOR DEFLUORINATION, AND RECOVERING FROM THE PROCESS AS DEFLUORINATED PHOSPHATE ROCK.
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) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |