Patent US2551881A successfully refreshed from Google Patents.
US2551881A
Expired / Lapsed
US
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Method of recovering hydrogen fluoride
Assignee: Phillips Petroleum Co
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Filing: 1947-09-05
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Granted: 1951-05-08
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Expires: 1967-09-05
Abstract
No abstract record available.
Inventors
- 👤 Karl H Hachmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:45
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
THE METHOD OF THE CHARACTER DESCRIBED, THE STEPS OF FRACTIONATING A STREAM OF A FLUID COMPRISING ACID-SOLUBLE OIL, WATER AND HYDROGEN FLUORIDE IN A FIRST FRACTIONATING MEANS CONTRUCTED OF A MATERIAL WHICH IS SUBJECT TO CORROSION BY DILUTE AQUEOUS HYDROFLUORIC ACID TO OBTAIN AN OIL FRACTION THAT IS SUBSTANTIALLY FREE OF WATER AND HYDROGEN FLUORIDE, A SUBSTANTIALLY NON-CORROSIVE WATER AND HYDROGEN FLUORIDE LIQUID FRACTION, AND A SUBSTANTIALLY ANHYDROUS HYDROGEN FLUORIDE VAPOR FRACTION, WHILE MAINTAINING THE WATER CONCENTRATION AT ALL POINTS IN SAID FIRST FRACTIONATING MEANS BELOW THAT WHICH WILL EFFECT CORROSION OF SAID MATERIAL OF CONSTRUCTION; FRACTIONATING A STREAM OF THE LIQUID FRACTION IN A SECOND FRACTION-
Claim 2
Independent Claim
107 words
THE METHOD OF THE CHARACTER DESCRIBED, THE STEPS OF FRACTIONATING A STREAM OF A FLUID COMPRISING ACID-SOLUBLE OIL, WATER AND HYDROGEN FLUORIDE IN A FIRST FRACTIONATING MEANS CONTRUCTED OF A MATERIAL WHICH IS SUBJECT TO CORROSION BY DILUTE AQUEOUS HYDROFLUORIC ACID TO OBTAIN AN OIL FRACTION THAT IS SUBSTANTIALLY FREE OF WATER AND HYDROGEN FLUORIDE, A SUBSTANTIALLY NON-CORROSIVE WATER AND HYDROGEN FLUORIDE LIQUID FRACTION, AND A SUBSTANTIALLY ANHYDROUS HYDROGEN FLUORIDE VAPOR FRACTION, WHILE MAINTAINING THE WATER CONCENTRATION AT ALL POINTS IN SAID FIRST FRACTIONATING MEANS BELOW THAT WHICH WILL EFFECT CORROSION OF SAID MATERIAL OF CONSTRUCTION; FRACTIONATING A STREAM OF THE LIQUID FRACTION IN A SECOND FRACTION-
References Cited (Backward Citations)
US2174118A
Cited
US2445217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |