Patent US2918802A successfully refreshed from Google Patents.
US2918802A
Expired / Lapsed
US
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Process of separation of air into its elements
Assignee: Air Liquide SA
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Filing: 1956-09-27
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Granted: 1959-12-29
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Expires: 1976-09-27
Abstract
No abstract record available.
Inventors
- 👤 Jacques F Grunberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:10
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J3/04187; F25J3/04218; F25J3/04006; F25J3/04078; F25J3/0409; F25J3/04248; F25J3/04284; F25J3/04309; F25J3/04315; F25J3/04406; F25J3/04412; F25J2200/00; F25J2200/20; F25J2200/50; F25J2200/52; F25J2205/00; F25J2205/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN A PROCESS OF PRODUCTION OF OXYGEN UNDER PRESSURE BY THE LIQUEFACTION AND RECTIFICATION OF AIR IN AT LEAST TWO RECTIFYING ZONES UNDER SUCCESSIVELY LOWER PRESSURES, WHEREIN THE AIR TO BE SEPARATED IS DIVIDED INTO TWO FRACTIONS, THE FIRST ONE OF WHICH IS COMPRESSED TO A HIGHER PRESSURE THAN THE SECOND ONE AND COOLED BY HEAT EXCHANGE WITH LIQUID OXYGEN UNDER PRESSURE, THEN INTRODUCED INTO A RECTIFYING ZONE AND THE SECOND ONE OF WHICH IS INTRODUCED UNDER ITS ORIGINAL PRESSURE INTO A RECTIFYING ZONE, THE IMPROVEMENT OF MAINTAINING A HIGHER THAN ATMOSPHERIC PRESSURE IN THE RECTIFYING ZONE UNDER THE LOWEST PRESSURE, AND EXPANDING WITH EXTERNAL WORK THE WHOLE OF THE SEPARATED NITROGEN FROM SAID LOWEST PRESSURE TO NEARLY ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
120 words
IN A PROCESS OF PRODUCTION OF OXYGEN UNDER PRESSURE BY THE LIQUEFACTION AND RECTIFICATION OF AIR IN AT LEAST TWO RECTIFYING ZONES UNDER SUCCESSIVELY LOWER PRESSURES, WHEREIN THE AIR TO BE SEPARATED IS DIVIDED INTO TWO FRACTIONS, THE FIRST ONE OF WHICH IS COMPRESSED TO A HIGHER PRESSURE THAN THE SECOND ONE AND COOLED BY HEAT EXCHANGE WITH LIQUID OXYGEN UNDER PRESSURE, THEN INTRODUCED INTO A RECTIFYING ZONE AND THE SECOND ONE OF WHICH IS INTRODUCED UNDER ITS ORIGINAL PRESSURE INTO A RECTIFYING ZONE, THE IMPROVEMENT OF MAINTAINING A HIGHER THAN ATMOSPHERIC PRESSURE IN THE RECTIFYING ZONE UNDER THE LOWEST PRESSURE, AND EXPANDING WITH EXTERNAL WORK THE WHOLE OF THE SEPARATED NITROGEN FROM SAID LOWEST PRESSURE TO NEARLY ATMOSPHERIC PRESSURE.
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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) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |