US2588786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing essentially silicon-free hydrofluoric acid from hydrofluosilicic acid
Assignee: Tennessee Corp
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Filing: 1948-06-23
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Granted: 1952-03-11
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Expires: 1968-06-23
Abstract
No abstract record available.
Inventors
- 👤 Ernest A Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:44
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN A PROCESS FOR OBTAINING HYDROFLUORIC ACID FROM HYDROFLUOSILICIC ACID THE STEPS OF TREATING A SOLUTION OF HYDROFLUOSILICIC ACID WITH SODIUM FLUORIDE TO FORM HYDROFLUORIC ACID IN SOLUTION AND PRECIPITATE SODIUM FLUOSILICATE, SEPARATING THE SODIUM FLUOSILICATE FROM THE HYDROFLUORIC ACID SOLUTION, HEAT TREATING THE SODIUM FLUOSILICATE TO OBTAIN SODIUM FLUORIDE, CYCLING THE SODIUM FLUORIDE BACK TO THE STEP OF MIXING THE SOLUTION OF HYDROFLUOSILICIC ACID WITH SODIUM FLUORIDE, TREATING THE HYDROFLUORIC ACID SOLUTION WITH SODIUM FLUORIDE TO PRECIPITATE SODIUM BIFLUORIDE, SEPARATING THE PRECIPITATED SODIUM BIFLUORIDE AND HEAT TREATING THE SODIUM BIFLUORIDE TO OBTAIN A CONCENTRATED HYDROFLUORIC ACID.
Claim 2
Dependent Claim
97 words
IN A PROCESS FOR OBTAINING HYDROFLUORIC ACID FROM HYDROFLUOSILICIC ACID THE STEPS OF TREATING A SOLUTION OF HYDROFLUOSILICIC ACID WITH SODIUM FLUORIDE TO FORM HYDROFLUORIC ACID IN SOLUTION AND PRECIPITATE SODIUM FLUOSILICATE, SEPARATING THE SODIUM FLUOSILICATE FROM THE HYDROFLUORIC ACID SOLUTION, HEAT TREATING THE SODIUM FLUOSILICATE TO OBTAIN SODIUM FLUORIDE, CYCLING THE SODIUM FLUORIDE BACK TO THE STEP OF MIXING THE SOLUTION OF HYDROFLUOSILICIC ACID WITH SODIUM FLUORIDE, TREATING THE HYDROFLUORIC ACID SOLUTION WITH SODIUM FLUORIDE TO PRECIPITATE SODIUM BIFLUORIDE, SEPARATING THE PRECIPITATED SODIUM BIFLUORIDE AND HEAT TREATING THE SODIUM BIFLUORIDE TO OBTAIN A CONCENTRATED HYDROFLUORIC ACID.
References Cited (Backward Citations)
US1244032A
Cited
US1367993A
Cited
US1297464A
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US1664348A
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US1903408A
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US2447359A
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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) | 1955-03-11 | 1955-09-10 | 1956-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-11 | 1959-09-10 | 1960-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-11 | 1963-09-10 | 1964-03-11 | $7700.00 | Window Closed / Lapsed |