Patent US2777754A successfully refreshed from Google Patents.
US2777754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of anhydrous hydrogen fluoride
Assignee: EIDP Inc
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Filing: 1951-07-13
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Granted: 1957-01-15
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Expires: 1971-07-13
Abstract
No abstract record available.
Inventors
- 👤 Weinmayr Viktor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:38
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR ELIMINATING SULFUR DIOXIDE FROM ANHYDROUS HYDROGEN FLUORIDE CONTAINING A SMALL AMOUNT OF THE SAID SULFUR DIOXIDE AS AN IMPURITY WHICH COMPRISES CONTACTING THE HYDROGEN FLUORIDE IN THE LIQUID PHASE AT A TEMPERATURE BETWEEN 20* AND 200*C. WITH AN INORGANIC OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF MANGANESE DIOXIDE, POTASSIUM PERMANGANTE AND THE CHLORATES, CHROMATES, DICHROMATES AND PEROXIDES AGENT BEING DIUM AND POTASSIUM, THE AMOUNT OF OXIDIZING AGENT BEING AT LEAST STOICHIOMETRIALLY EQUIVALENT TO THE AMOUNT OF SULFUR DIOXIDE ORIGINALLY PRESENT IN THE HYDROGEN FLUORIDE, UNTIL THE SULFUR DIOXIDE IS COMPLETELY OXIDIZED.
Claim 2
Dependent Claim
95 words
A PROCESS FOR ELIMINATING SULFUR DIOXIDE FROM ANHYDROUS HYDROGEN FLUORIDE CONTAINING A SMALL AMOUNT OF THE SAID SULFUR DIOXIDE AS AN IMPURITY WHICH COMPRISES CONTACTING THE HYDROGEN FLUORIDE IN THE LIQUID PHASE AT A TEMPERATURE BETWEEN 20* AND 200*C. WITH AN INORGANIC OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF MANGANESE DIOXIDE, POTASSIUM PERMANGANTE AND THE CHLORATES, CHROMATES, DICHROMATES AND PEROXIDES AGENT BEING DIUM AND POTASSIUM, THE AMOUNT OF OXIDIZING AGENT BEING AT LEAST STOICHIOMETRIALLY EQUIVALENT TO THE AMOUNT OF SULFUR DIOXIDE ORIGINALLY PRESENT IN THE HYDROGEN FLUORIDE, UNTIL THE SULFUR DIOXIDE IS COMPLETELY OXIDIZED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |