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US2985508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of metal fluorides
Assignee: Dow Chemical Co
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Filing: 1957-01-07
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Granted: 1961-05-23
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Expires: 1977-01-07
Abstract
No abstract record available.
Inventors
- 👤 Robert E Fredrickson
- 👤 William A Mod
- 👤 Bob R Harrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:11
CPC Classifications
C; C01; C01F; C01F1/00; C01B; C01B9/00; C01B9/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR THE PREPARATION OF A METAL FLUORIDE FROM CALCIUM FLUORIDE, WHICH COMPRISES INTERMIXING THE CALCIUM FLUORIDE WITH AN AQUEOUS SOLUTION OF MAGNESIUM CHLORIDE CONTAINING IN THE RANGE OF FROM 10 TO 30 WEIGHT PERCENT MAGNESIUM CHLORIDE TO FROM A SLURRY, HEATING THE SLURRY AT A TEMPERATURE IN THE RANGE OF 200* TO 270*C. UNDER SUFFICIENT PRESSURE TO PREVENT SUBSTANTIAL VAPORIZATION OF WATER FROM THE SLURRY SO AS TO CONVERT THE CALCIUM FLUORIDE TO CACIUM CHLORIDE AND THE MAGNESIUM CHLORIDE TO MAGNESIUM FLUORIDE, SEPARATING THE MAGNESIUM FLUORIDE FROM THE CALCIUM CHLORIDE AND INTERS, INTERMIXING THE RECOVERED MAGNEISUM FLUORIDE WITH A HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, LITHIUM HYDROXIDE, POTASSIUM HYDROXIDE, STONTIUM HYDROXIDE AND BARIUM HYDROXIDE TO MAGNESIUM FLUORIDE AND THE HYDROXIDE TO MAGNESIUM HYDROXIDE AND A METAL FLUORIDE, AND RECOVERING THE METAL FLUORIDE FROM THE REACTED MIXTURE.
Claim 2
Dependent Claim
141 words
A PROCESS FOR THE PREPARATION OF A METAL FLUORIDE FROM CALCIUM FLUORIDE, WHICH COMPRISES INTERMIXING THE CALCIUM FLUORIDE WITH AN AQUEOUS SOLUTION OF MAGNESIUM CHLORIDE CONTAINING IN THE RANGE OF FROM 10 TO 30 WEIGHT PERCENT MAGNESIUM CHLORIDE TO FROM A SLURRY, HEATING THE SLURRY AT A TEMPERATURE IN THE RANGE OF 200* TO 270*C. UNDER SUFFICIENT PRESSURE TO PREVENT SUBSTANTIAL VAPORIZATION OF WATER FROM THE SLURRY SO AS TO CONVERT THE CALCIUM FLUORIDE TO CACIUM CHLORIDE AND THE MAGNESIUM CHLORIDE TO MAGNESIUM FLUORIDE, SEPARATING THE MAGNESIUM FLUORIDE FROM THE CALCIUM CHLORIDE AND INTERS, INTERMIXING THE RECOVERED MAGNEISUM FLUORIDE WITH A HYDROXIDE SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, LITHIUM HYDROXIDE, POTASSIUM HYDROXIDE, STONTIUM HYDROXIDE AND BARIUM HYDROXIDE TO MAGNESIUM FLUORIDE AND THE HYDROXIDE TO MAGNESIUM HYDROXIDE AND A METAL FLUORIDE, AND RECOVERING THE METAL FLUORIDE FROM THE REACTED 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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |