Patent US4845796A successfully refreshed from Google Patents.
Patent US2996355A successfully refreshed from Google Patents.
US2996355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of sodium aluminum fluorides
Assignee: Reynolds Metals Co
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Filing: 1958-09-12
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Granted: 1961-08-15
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Expires: 1978-09-12
Abstract
No abstract record available.
Inventors
- 👤 Kamlet Jonas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:53
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/48; C01F7/50; C01F7/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
A PROCESS FOR THE MANUFACTURE OF SODIUM ALUMINUM FLUORIDES OF COMPOSITIONS CONSISTING OF FROM 62.5 TO 75.0 MOLE-PERCENT SODIUM FLUORIDE AND 25.0 TO 37.5 MOLE-PERCENT ALUMINUM FLUORIDE WHICH CONSISTS OF THE STEPS OF: (A) REACTING AN AQUEOUS HYDROFLUORIC ACID SOLUTION CONTAINING FLUOSILICIC ACID WITH A SODIUM COMPOUND CHOSEN FROM THE GROUP CONSISTING OF SODIUM CHLORIDE AND SODIUM SULFATE IN AMOUNTS EQUIVALENT TO FROM 3.0 TO 5.0 MOLEEQUIVALENTS OF SODIUM COMPOUND PER MOLE OF FLUOSILICIC ACID IN SAID HYDROFLUORIC ACID SOLUTION, (B) SEPARATING THE PRECIPITATED SODIUM SILICOFLUORIDE FROM THE DESILICATED HYDROFLUORIC ACID SOLUTION CONTAINING DISSOLVED SODIUM COMPOUND, (C) REACTING THE SAID DESILICATED HYDROFLUORIC ACID SOLUTION WITH A MEMBER OF THE GROUP CONSISTING OF ALUMINUM OXIDE AND ALUMINUM HYDROXIDE, SAID ALUMINUM COMPOUND BEING SUBSTANTIALLY FREE OF SILICA, AND AN ADDITIONAL QUANTITY OF A SODIUM COMPOUND CHOSEN FROM THE GROUP CONSISTING OF SODIUM CHLORIDE AND SODIUM SULFATE, THE TOTAL AMOUNTS OF SODIUM ION, ALUMINUM ION AND FLUORIDE ION IN SAID REACTION MIXTURE BEING EQUIVALENT TO FROM 62.5 TO 75.0 MOLE-PERCENT SODIUM FLUORIDE AND FROM 25.0 TO 37.5 MOLE-PERCENT ALUMINUM FLUORIDE, AND (D) SEPARATING THE PRECIPITATED SODIUM ALUMINUM FLUORIDE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
189 words
A PROCESS FOR THE MANUFACTURE OF SODIUM ALUMINUM FLUORIDES OF COMPOSITIONS CONSISTING OF FROM 62.5 TO 75.0 MOLE-PERCENT SODIUM FLUORIDE AND 25.0 TO 37.5 MOLE-PERCENT ALUMINUM FLUORIDE WHICH CONSISTS OF THE STEPS OF: (A) REACTING AN AQUEOUS HYDROFLUORIC ACID SOLUTION CONTAINING FLUOSILICIC ACID WITH A SODIUM COMPOUND CHOSEN FROM THE GROUP CONSISTING OF SODIUM CHLORIDE AND SODIUM SULFATE IN AMOUNTS EQUIVALENT TO FROM 3.0 TO 5.0 MOLEEQUIVALENTS OF SODIUM COMPOUND PER MOLE OF FLUOSILICIC ACID IN SAID HYDROFLUORIC ACID SOLUTION, (B) SEPARATING THE PRECIPITATED SODIUM SILICOFLUORIDE FROM THE DESILICATED HYDROFLUORIC ACID SOLUTION CONTAINING DISSOLVED SODIUM COMPOUND, (C) REACTING THE SAID DESILICATED HYDROFLUORIC ACID SOLUTION WITH A MEMBER OF THE GROUP CONSISTING OF ALUMINUM OXIDE AND ALUMINUM HYDROXIDE, SAID ALUMINUM COMPOUND BEING SUBSTANTIALLY FREE OF SILICA, AND AN ADDITIONAL QUANTITY OF A SODIUM COMPOUND CHOSEN FROM THE GROUP CONSISTING OF SODIUM CHLORIDE AND SODIUM SULFATE, THE TOTAL AMOUNTS OF SODIUM ION, ALUMINUM ION AND FLUORIDE ION IN SAID REACTION MIXTURE BEING EQUIVALENT TO FROM 62.5 TO 75.0 MOLE-PERCENT SODIUM FLUORIDE AND FROM 25.0 TO 37.5 MOLE-PERCENT ALUMINUM FLUORIDE, AND (D) SEPARATING THE PRECIPITATED SODIUM ALUMINUM FLUORIDE FROM THE REACTION MIXTURE.
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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |