US2555656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing a calcium phosphate
Assignee: Directie van de Staatsmijnen in Limburg
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Filing: 1947-04-08
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Granted: 1951-06-05
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Expires: 1967-04-08
Abstract
No abstract record available.
Inventors
- 👤 Mathijs H R J Plusje
- 👤 Bruijn Hendrik De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:59
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR THE PRODUCTION OF A CALCIUM PHOSPHATE PRODUCT CORRESPONDING TO THE FROMULA CA13(PO4) 6CO3 WHICH IS INSOLUBLE IN WATER, BUT SOLUBLE IN CITRIC ACID AND CITRATE SOLUTIONS, WHICH COMPRISES THE STEPS OF, INTRODUCING CONTINUOUSLY AND SIMULTANEOUSLY INTO A BODY OF PREVIOUSLY NEUTRALIZED REACTION MASS HAVING A PH VALUE OF 6-8 SEPARATE STREAMS OF AN ACID SOLUTION OF RAW PHOSPHATE MATERIAL HAVING A MOLECULAR RATIO OF DISSOLVED CAO TO DISSOLVED P2O5 GREATER THAN 3.3 AN ALKALINE NEUTRALIZING AGENT AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, WATER SOLUBLE CARBONATES AND WATER SOLUBLE BICARBONATES, REGULATING THE INTROUCTION OF SAID STREAMS SO AS TO MAINTAIN CONTINUOUSLY THE PH OF THE REACTION MIXTURE AT BETWEEN 6 AND 8, AND THEREBY PRECIPITATING A CALCIUM PHOSPHATE PRODUCT AS DEFINED ABOVE, AND RECOVERING THE PRECIPITATED CALCIUM PHOSPHATE.
Claim 2
Dependent Claim
135 words
A PROCESS FOR THE PRODUCTION OF A CALCIUM PHOSPHATE PRODUCT CORRESPONDING TO THE FROMULA CA13(PO4) 6CO3 WHICH IS INSOLUBLE IN WATER, BUT SOLUBLE IN CITRIC ACID AND CITRATE SOLUTIONS, WHICH COMPRISES THE STEPS OF, INTRODUCING CONTINUOUSLY AND SIMULTANEOUSLY INTO A BODY OF PREVIOUSLY NEUTRALIZED REACTION MASS HAVING A PH VALUE OF 6-8 SEPARATE STREAMS OF AN ACID SOLUTION OF RAW PHOSPHATE MATERIAL HAVING A MOLECULAR RATIO OF DISSOLVED CAO TO DISSOLVED P2O5 GREATER THAN 3.3 AN ALKALINE NEUTRALIZING AGENT AND A MATERIAL SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, WATER SOLUBLE CARBONATES AND WATER SOLUBLE BICARBONATES, REGULATING THE INTROUCTION OF SAID STREAMS SO AS TO MAINTAIN CONTINUOUSLY THE PH OF THE REACTION MIXTURE AT BETWEEN 6 AND 8, AND THEREBY PRECIPITATING A CALCIUM PHOSPHATE PRODUCT AS DEFINED ABOVE, AND RECOVERING THE PRECIPITATED CALCIUM PHOSPHATE.
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) | 1954-06-04 | 1954-12-04 | 1955-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-04 | 1958-12-04 | 1959-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-04 | 1962-12-04 | 1963-06-05 | $7700.00 | Window Closed / Lapsed |