Patent US2270991A successfully refreshed from Google Patents.
US3140152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing and recovering of substantially anhydrous hydrogen fluoride gas from a dry alkali metal bifluoride
Assignee: Hooker Chemical Corp
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Filing: 1962-06-29
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Granted: 1964-07-07
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Expires: 1982-06-29
Abstract
No abstract record available.
Inventors
- 👤 John T Rucker
- 👤 Theodore H Dexter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:40
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
IN A PROCESS FOR PREPARING A SUBSTANTIALLY ANHYDROUS HYDROGEN FLUORIDE GAS BY DECOMPOSING AN ALKALI METAL BIFLUORIDE FORMED BY REACTING AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID AND AN ALKALI METAL FLUORIDE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE REACTION BETWEEN THE HYDROFLUORIC ACID AND THE ALKALI METAL FLUORIDE BY SPRAYING AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID ON HEATED PARTICLES OF AN ALKALI METAL FLUORIDE, THE MOLAR RATIO OF ALKALI METAL FLUORIDE TO H F IN THE HYDROFLUORIC ACID BEING AT LEAST 1:1 AND THE TEMPERATURE OF THE ALKALI METAL FLUORIDE PARTICLES, IN CONJUNCTION WITH THE TEMPERATURE OF THE HYDROFLUORIC ACID SOLUTION, PROVIDING A REACTION TEMPERATURE OF AT LEAST ABOUT 100 DEGREES CENTIGRADE BUT LESS THAN ABOUT 280 DEGREES CENTIGRADE, MAINTAINING THIS REACTION TEMPERATURE FOR A PERIOD OF TIME SUFFICIENT TO EVAPORATE AT LEAST A MAJOR AMOUNT OF THE WATER OF THE AQUEOUS HYDRO-
Claim 2
Dependent Claim
142 words
IN A PROCESS FOR PREPARING A SUBSTANTIALLY ANHYDROUS HYDROGEN FLUORIDE GAS BY DECOMPOSING AN ALKALI METAL BIFLUORIDE FORMED BY REACTING AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID AND AN ALKALI METAL FLUORIDE, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE REACTION BETWEEN THE HYDROFLUORIC ACID AND THE ALKALI METAL FLUORIDE BY SPRAYING AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID ON HEATED PARTICLES OF AN ALKALI METAL FLUORIDE, THE MOLAR RATIO OF ALKALI METAL FLUORIDE TO H F IN THE HYDROFLUORIC ACID BEING AT LEAST 1:1 AND THE TEMPERATURE OF THE ALKALI METAL FLUORIDE PARTICLES, IN CONJUNCTION WITH THE TEMPERATURE OF THE HYDROFLUORIC ACID SOLUTION, PROVIDING A REACTION TEMPERATURE OF AT LEAST ABOUT 100 DEGREES CENTIGRADE BUT LESS THAN ABOUT 280 DEGREES CENTIGRADE, MAINTAINING THIS REACTION TEMPERATURE FOR A PERIOD OF TIME SUFFICIENT TO EVAPORATE AT LEAST A MAJOR AMOUNT OF THE WATER OF THE AQUEOUS HYDRO-
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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |