Patent US2779174A successfully refreshed from Google Patents.
US2779174A
Expired / Lapsed
US
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Low temperature separation of gaseous mixtures
Assignee: Air Liquide SA
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Filing: 1954-10-29
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Granted: 1957-01-29
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Expires: 1974-10-29
Abstract
No abstract record available.
Inventors
- 👤 Vesque Henri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:40
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/04666; F25J3/04672; F25J3/04151; F25J3/04242; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04406; F25J3/04412; F25J3/04684; F25J3/04763; F25J3/04769; F25J3/04854; F25J2200/00; F25J2200/50; F25J2200/52; F25J2200/90; F25J2205/00; F25J2205/60; Y; Y10; Y10S; Y10S62/00; Y10S62/939; Y10S62/94
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS FOR THE SEPARATION BY LIQUEFACTION AND RECTIFICATION, OF A GASEOUS MIXTURE HAVING THREE PRINCIPAL CONSITUENTS, UTILIZING A MAIN COLUMN MADE UP OF TWO RECTIFICATION ZONES IN MUTAL HEAT EXCHANGE RELATIONSHIP AND UNDER DIFFERENT PRESSURES, AND AN AUXILIARY COLUMN RECEIVING A FRACTION HAVING ITS ORIGIN IN THE LOWER PRESSURE RECTIFICATION ZONE AND IN WHICH A PART OF THE MIXTURE TO BE SEPARATED PREVIOUSLY COMPRESSED TO A PRESSURE HIGHERE THAN THAT OF THE HIGHER PRESSURE RECTIFICATION ZONE IS EXPANDED TO THE HIGHER PRESSURE AND INTRODUCED INTO THE HIGHER PRESSURE ZONE, COMPRISING LIQUEFYING ANOTHER PART OF THE COMPRESSED GASEOUS MIXTURE BY INDIRECT HEAT EXCHANGE WITH A LIQUID FROM THE HIGHER PRESSURE RECTIFICATION ZONE, THEN UTILIZING SAID OTHER PART FOR COOLING BY INDIRECT CONTACT WITH THE AUXILIARY COLUMN AND INTRODUCING SAID OTHER PART INTO THE LOWER PRESSURE ZONE.
Claim 2
Dependent Claim
136 words
A PROCESS FOR THE SEPARATION BY LIQUEFACTION AND RECTIFICATION, OF A GASEOUS MIXTURE HAVING THREE PRINCIPAL CONSITUENTS, UTILIZING A MAIN COLUMN MADE UP OF TWO RECTIFICATION ZONES IN MUTAL HEAT EXCHANGE RELATIONSHIP AND UNDER DIFFERENT PRESSURES, AND AN AUXILIARY COLUMN RECEIVING A FRACTION HAVING ITS ORIGIN IN THE LOWER PRESSURE RECTIFICATION ZONE AND IN WHICH A PART OF THE MIXTURE TO BE SEPARATED PREVIOUSLY COMPRESSED TO A PRESSURE HIGHERE THAN THAT OF THE HIGHER PRESSURE RECTIFICATION ZONE IS EXPANDED TO THE HIGHER PRESSURE AND INTRODUCED INTO THE HIGHER PRESSURE ZONE, COMPRISING LIQUEFYING ANOTHER PART OF THE COMPRESSED GASEOUS MIXTURE BY INDIRECT HEAT EXCHANGE WITH A LIQUID FROM THE HIGHER PRESSURE RECTIFICATION ZONE, THEN UTILIZING SAID OTHER PART FOR COOLING BY INDIRECT CONTACT WITH THE AUXILIARY COLUMN AND INTRODUCING SAID OTHER PART INTO THE LOWER PRESSURE ZONE.
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) | 1960-01-29 | 1960-07-30 | 1961-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-29 | 1964-07-30 | 1965-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-29 | 1968-07-30 | 1969-01-29 | $7700.00 | Window Closed / Lapsed |