Patent US2504446A successfully refreshed from Google Patents.
US2504446A
Expired / Lapsed
US
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Fluorine removal process
Assignee: Directie van de Staatsmijnen in Limburg
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Filing: 1947-07-31
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Granted: 1950-04-18
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Expires: 1967-07-31
Abstract
No abstract record available.
Inventors
- 👤 Mathijs H R J Plusje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:27
CPC Classifications
C; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
METHOD OF REMOVING FLUORINE FROM ACIDIC SOLUTIONS CONTAINING NITRATE AND PHOSPHATE IONS, OBTAINED BY DISSOLVING RAW PHOSPHATE MATERIAL IN NITRIC ACID, WHICH COMPRISES STEAM DISTILLING THE FLUORINE FROM THE SOLUTIONS IN THE FORM OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HF AND SIF4, BY TREATMENT WITH STEAM SO THAT THE VAPOR MIXTURE LEAVES THE LIQUID AT A TEMPERATURE BETWEEN 120 AND 140*C.
Claim 2
Dependent Claim
64 words
METHOD OF REMOVING FLUORINE FROM ACIDIC SOLUTIONS CONTAINING NITRATE AND PHOSPHATE IONS, OBTAINED BY DISSOLVING RAW PHOSPHATE MATERIAL IN NITRIC ACID, WHICH COMPRISES STEAM DISTILLING THE FLUORINE FROM THE SOLUTIONS IN THE FORM OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF HF AND SIF4, BY TREATMENT WITH STEAM SO THAT THE VAPOR MIXTURE LEAVES THE LIQUID AT A TEMPERATURE BETWEEN 120 AND 140*C.
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) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |