US2556064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of potassium silicofluoride
Assignee: SMITH DOUGLASS CO Inc
•
Filing: 1946-05-22
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Granted: 1951-06-05
•
Expires: 1966-05-22
Abstract
No abstract record available.
Inventors
- 👤 Caldwell Paul
- 👤 Kieffer Dale Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:30
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08; C01B33/10; C01B33/103; C01D; C01D3/00; C01D3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PROCESS FOR PRODUCING POTASSIUM SILICOFLUORIDE WHICH COMPRISES REACTING AT A TEMPERATURE NOT SUBSTANTIALLY BELOW 95* F. AN AQUEOUS SOLUTION OF FLUOSILICIC ACID SUBSTANTIALLY FREE OF SILICA WITH A DILUTE AQUEOUS SOLUTION OF POTASSIUM CHLORIDE CONTAINING NOT MORE THAN ABOUT 35 GRAMS OF POTASSIUM CHLROIDE PER LITER AND SUBSTANTIALLY FREE OF THE INSOLUBLE IMPURITIES NORMALLY PRESENT IN COMMERCIAL POTASSIUM CHLORIDE, SO THAT POTASSIUM SILICOFLUORIDE CRYSTALS READILY SEPARABLE FROM THEIR MOTHER LIQUOR ARE FORMED.
Claim 2
Dependent Claim
73 words
A PROCESS FOR PRODUCING POTASSIUM SILICOFLUORIDE WHICH COMPRISES REACTING AT A TEMPERATURE NOT SUBSTANTIALLY BELOW 95* F. AN AQUEOUS SOLUTION OF FLUOSILICIC ACID SUBSTANTIALLY FREE OF SILICA WITH A DILUTE AQUEOUS SOLUTION OF POTASSIUM CHLORIDE CONTAINING NOT MORE THAN ABOUT 35 GRAMS OF POTASSIUM CHLROIDE PER LITER AND SUBSTANTIALLY FREE OF THE INSOLUBLE IMPURITIES NORMALLY PRESENT IN COMMERCIAL POTASSIUM CHLORIDE, SO THAT POTASSIUM SILICOFLUORIDE CRYSTALS READILY SEPARABLE FROM THEIR MOTHER LIQUOR ARE FORMED.
References Cited (Backward Citations)
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Cited
US1634122A
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GB222838A
Cited
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Cited
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Cited
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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) | 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 |