US2899292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saw phosphate rock
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:11
CPC Classifications
C; C05; C05B; C05B7/00; Y; Y10; Y10S; Y10S71/00; Y10S71/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A METHOD OF PRODUCING DIHYDROGEN PHOSPHATES OF THE GROUP CONSISTING OF ALKALI METAL DIHYDROGEN PHOSPHATES AND AMMONIUM DIHYDROGEN PHOSPHATES WHICH COMPRISES: TREATING AN ALKALINE EARTH PHOSPHATE-CONTAINING MATERIAL AT AN ELEVATED TEMPERATURE WITH AN AMOUNT OF H3PO4 EQUAL TO THAT PRESENT IN AT LEAST 1.8 TIMES ITS WEIGHT OF 85% H3PO4, SAID H3PO4 HAVING A STRENGTH OF BETWEEN 60% H3PO4 AND 100% H3PO4, THE AMOUNT OF SAID ACID BEING SUFFICIENT TO DECOMPOSE THE PHOSPHATE TO A COMPLETELY WATER SOLUBLE PHOSPHATE PRODUCT; DISSOLVING THE SAID PRODUCT IN WATER; SEPARATING ANY INSOLUBLE RESIDUE FROM THE SOLUTION FORMED; ADDING TO THE SOLUTION, AN ACID FROM THE GROUP CONSISTING OF SULPHURIC, BORIC AND HYDROFLUORIC AND A SALT OF SAID ACID FROM THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM SALTS, WHEREBY THE ALKALINE EARTH SALT OF SAID ACID IS PRECIPITATED AND PHOSPHORIC ACID IS REGENERATED; SEPARATING AND SEPARATELY RECOVERING THE PRECIPITATED ALKALINE EARTH SALT AND THE PHOSPHORIC ACID CONTAINING LIQUID; EXTRACTING THE PHOSPHORIC ACID FROM SAID SEPARATELY RECOVERED LIQUID BY MEANS OF AN ORGANIC EXTRACTION AGENT LEAVING AN ACID-DEPLETED LIQUID; AND EVAPORATING THE RESIDUAL ACID-DEPLETED LIQUID TO RECOVER A DIHYDROGEN PHOSPHATE THEREFROM.
Claim 2
Independent Claim
187 words
A METHOD OF PRODUCING DIHYDROGEN PHOSPHATES OF THE GROUP CONSISTING OF ALKALI METAL DIHYDROGEN PHOSPHATES AND AMMONIUM DIHYDROGEN PHOSPHATES WHICH COMPRISES: TREATING AN ALKALINE EARTH PHOSPHATE-CONTAINING MATERIAL AT AN ELEVATED TEMPERATURE WITH AN AMOUNT OF H3PO4 EQUAL TO THAT PRESENT IN AT LEAST 1.8 TIMES ITS WEIGHT OF 85% H3PO4, SAID H3PO4 HAVING A STRENGTH OF BETWEEN 60% H3PO4 AND 100% H3PO4, THE AMOUNT OF SAID ACID BEING SUFFICIENT TO DECOMPOSE THE PHOSPHATE TO A COMPLETELY WATER SOLUBLE PHOSPHATE PRODUCT; DISSOLVING THE SAID PRODUCT IN WATER; SEPARATING ANY INSOLUBLE RESIDUE FROM THE SOLUTION FORMED; ADDING TO THE SOLUTION, AN ACID FROM THE GROUP CONSISTING OF SULPHURIC, BORIC AND HYDROFLUORIC AND A SALT OF SAID ACID FROM THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM SALTS, WHEREBY THE ALKALINE EARTH SALT OF SAID ACID IS PRECIPITATED AND PHOSPHORIC ACID IS REGENERATED; SEPARATING AND SEPARATELY RECOVERING THE PRECIPITATED ALKALINE EARTH SALT AND THE PHOSPHORIC ACID CONTAINING LIQUID; EXTRACTING THE PHOSPHORIC ACID FROM SAID SEPARATELY RECOVERED LIQUID BY MEANS OF AN ORGANIC EXTRACTION AGENT LEAVING AN ACID-DEPLETED LIQUID; AND EVAPORATING THE RESIDUAL ACID-DEPLETED LIQUID TO RECOVER A DIHYDROGEN PHOSPHATE THEREFROM.
References Cited (Backward Citations)
USRE19045E
Cited
US1929441A
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US2567227A
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US2759795A
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US2680679A
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US2683075A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |