US3101254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of silica free hydrogen fluoride
Assignee: WR Grace and Co
•
Filing: 1961-03-16
•
Granted: 1963-08-20
•
Expires: 1981-03-16
Abstract
No abstract record available.
Inventors
- 👤 George L Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:02
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN PRODUCTION OF SUBSTANTIALLY PURE HYDROGEN FLUORIDE THE STEPS OF: COMBINING ALKALI METAL FLUORIDE AND AMMONIUM BIFLUORIDE IN AQUEOUS SOLUTION, STIRING FOR TWO HOURS AT 25*C., FILTERING TO REMOVE ALAKLI METAL BIFLUORIDE AS A SOLID FROM THE SOLUTION, EVAPORATING THE FILTRATE TO CONCENTRATE IT WTIH RESPECT TO ALKALI METAL BIFLUORIDE, COOLING TO 25* FOR THE PURPOSE OF CRYSTALLIZING ADDITIONAL ALKALI METAL BIFLUORIDE, STIRRING FOR TWO HOURS AT 25*C., FILTERING TO REMOVE ALKALI METAL BIFLUORIDE AS A SOLID FROM THE SOLUTION, EVAPORATING THE FILTRATE TO CONCENTRATE IT WITH RESPECT TO ALKALI METAL BIFLUORIDE, COOLING TO 25* FOR THE PURPOSE OF CRYSTALLIZING ADDITIONAL ALKALI METAL BIFLUORIDE, STIRRING FOR TWO HOURS, FILTERING TO REMOVE ALKALI METAL BIFLUORIDE AS A SOLID, HEATING SAID ALAKLI METAL BIFLUORIDE TO 300-450*, THEREBY LIBERATING SILICA-FREE HYDROGEN FLUORIDE AND RECOVERING SAID HYDROGEN FLUORIDE AS A GAS.
Claim 2
Dependent Claim
137 words
IN PRODUCTION OF SUBSTANTIALLY PURE HYDROGEN FLUORIDE THE STEPS OF: COMBINING ALKALI METAL FLUORIDE AND AMMONIUM BIFLUORIDE IN AQUEOUS SOLUTION, STIRING FOR TWO HOURS AT 25*C., FILTERING TO REMOVE ALAKLI METAL BIFLUORIDE AS A SOLID FROM THE SOLUTION, EVAPORATING THE FILTRATE TO CONCENTRATE IT WTIH RESPECT TO ALKALI METAL BIFLUORIDE, COOLING TO 25* FOR THE PURPOSE OF CRYSTALLIZING ADDITIONAL ALKALI METAL BIFLUORIDE, STIRRING FOR TWO HOURS AT 25*C., FILTERING TO REMOVE ALKALI METAL BIFLUORIDE AS A SOLID FROM THE SOLUTION, EVAPORATING THE FILTRATE TO CONCENTRATE IT WITH RESPECT TO ALKALI METAL BIFLUORIDE, COOLING TO 25* FOR THE PURPOSE OF CRYSTALLIZING ADDITIONAL ALKALI METAL BIFLUORIDE, STIRRING FOR TWO HOURS, FILTERING TO REMOVE ALKALI METAL BIFLUORIDE AS A SOLID, HEATING SAID ALAKLI METAL BIFLUORIDE TO 300-450*, THEREBY LIBERATING SILICA-FREE HYDROGEN FLUORIDE AND RECOVERING SAID HYDROGEN FLUORIDE AS A GAS.
References Cited (Backward Citations)
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US1911004A
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US2588786A
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DE1010504B
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US3005684A
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US2880060A
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US2981601A
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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) | 1966-08-19 | 1967-02-18 | 1967-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-19 | 1971-02-18 | 1971-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-19 | 1975-02-18 | 1975-08-20 | $7700.00 | Window Closed / Lapsed |