US2778712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digestion of phosphate rock
Assignee: Cannac Research and Development Co
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Filing: 1954-07-02
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Granted: 1957-01-22
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Expires: 1974-07-02
Abstract
No abstract record available.
Inventors
- 👤 Caldwell Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:38
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN THE PRODUCTION OF TRICALCIUM PHOSPHATE IN THE FORM OF A PERICIPATE OBTAINED BY AMMONIATION OF AN ACIDIC AQUEOUS MEDIUM RESULTING FROM THE NITRIC ACID DIGESTION OF FLUORINE-CONTAINING PHOSPHATE ROCK, SAID AQUEOUS MEDIUM WHICH IS SUBJECTED TO AMMONIATION CONTAINING THE ACID-SOLUBILIZED CALCIUM AND PHOSPHOROUS COMPONENTS OF THE ROCK IN PROPORTIONS SUCH THAT THE CALCIUM COMPONENT IS PRESENT IN AMOUNT SUBSTANTIALLY SUFFICIENT TO COMBINE WITH THE PHOSPHORUS COMPONENT IN THE FORM OF TRICALCIUM PHOSPHATE, THE IMPOVEMENT WHICH COMPRISES IMPARTING TO THE THUS-PRECIPITATED TRICALCIUM PHOSPHATE PRODUCT AN INCREASED RESISTANCE TO REVERSION TO A CITRATE-INSOLUBLE PHOSPHATIC PRODUCT DURING SUBSEQUENT DRYING BY ADDING TO SAID CALCIUM-CONTAINING AQUEOUS MEDIUM PRIOR TO AMMONIATION AN AMOUNT OF POTASSIUM CHLORIDE SUFFICIENT NOT ONLY TO PROVIDE A STOICHIOMETRIC EQUIVALENT FOR THE ACID-SOLUBLE FLUORINE COMPONENT OF THE ROCK IN THE FORM OF POTASSIUM FLUOSILICATE BUT TO FURTHER PROVIDE FROM ABOUT ONE-THIRD MOL TO ABOUT ONE AND ONEHALF MOLS OF POTASSIUM CHLORIDE PER MOL OF CALCIUM NITATE IN SAID AQUEOUS MEDIUM.
Claim 2
Dependent Claim
160 words
IN THE PRODUCTION OF TRICALCIUM PHOSPHATE IN THE FORM OF A PERICIPATE OBTAINED BY AMMONIATION OF AN ACIDIC AQUEOUS MEDIUM RESULTING FROM THE NITRIC ACID DIGESTION OF FLUORINE-CONTAINING PHOSPHATE ROCK, SAID AQUEOUS MEDIUM WHICH IS SUBJECTED TO AMMONIATION CONTAINING THE ACID-SOLUBILIZED CALCIUM AND PHOSPHOROUS COMPONENTS OF THE ROCK IN PROPORTIONS SUCH THAT THE CALCIUM COMPONENT IS PRESENT IN AMOUNT SUBSTANTIALLY SUFFICIENT TO COMBINE WITH THE PHOSPHORUS COMPONENT IN THE FORM OF TRICALCIUM PHOSPHATE, THE IMPOVEMENT WHICH COMPRISES IMPARTING TO THE THUS-PRECIPITATED TRICALCIUM PHOSPHATE PRODUCT AN INCREASED RESISTANCE TO REVERSION TO A CITRATE-INSOLUBLE PHOSPHATIC PRODUCT DURING SUBSEQUENT DRYING BY ADDING TO SAID CALCIUM-CONTAINING AQUEOUS MEDIUM PRIOR TO AMMONIATION AN AMOUNT OF POTASSIUM CHLORIDE SUFFICIENT NOT ONLY TO PROVIDE A STOICHIOMETRIC EQUIVALENT FOR THE ACID-SOLUBLE FLUORINE COMPONENT OF THE ROCK IN THE FORM OF POTASSIUM FLUOSILICATE BUT TO FURTHER PROVIDE FROM ABOUT ONE-THIRD MOL TO ABOUT ONE AND ONEHALF MOLS OF POTASSIUM CHLORIDE PER MOL OF CALCIUM NITATE IN SAID AQUEOUS MEDIUM.
References Cited (Backward Citations)
US2683075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |