US2765637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frigorific separation process of gas mixture by liquefying and rectifying
Assignee: Air Liquide SA
•
Filing: 1951-10-10
•
Granted: 1956-10-09
•
Expires: 1971-10-10
Abstract
No abstract record available.
Inventors
- 👤 Etienne Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:50
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0233; F25J3/0204; F25J3/0209; F25J3/0257; F25J3/04; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/04709; F25J3/04715; F25J3/04763; F25J3/04866; F25J3/04872; F25J2200/00; F25J2200/04; F25J2200/06; F25J2200/08; F25J2200/10; F25J2200/34; F25J2200/50; F25J2200/52; F25J2200/80; F25J2205/00; F25J2205/02; F25J2230/00; F25J2230/58; F25J2250/00; F25J2250/30; F25J2250/40; F25J2250/50; F25J2270/00; F25J2270/04; F25J2270/06; F25J2270/42; F25J2290/00; F25J2290/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A METHOD FOR LOW TEMPERATURE SEPARATION OF A GASEOUS MIXTURE INTO AT LEAST TWO FRACTIONS HAVING DIFFERENT BOILING POINTS, BY SUCCESSIVE FRACTIONATION, IN TWO RECTIFRICATION COLUMNS OPERATING UNDER DIFFERENT PRESSURES AND PROVIDED WITH A HEAT TRANSFER UNIT ACTING AS A CONDENSER FOR THE TOP OF THE HIGHER PRESSURE COLUMN AND AS A BOILER FOR THE BOTTOM OF THE LOW PRESSURE COLUMN, WHICH COMPRISES, PARTLY LIQUEFYING SAID GASEOUS MIXTURE AND ENTERING IT IN THE LOWER PRESSURE COLUMN, REMOVING FROM THE BOTTOM OF SAID COLUMN THE HIGHER BOILING FRACTION AND FROM ITS TOP A GASEOUS EFFLUENT, COMPRESSING THE WHOLE OF SAID EFFLUENT AND ENTERING IT IN THE HIGHER PRESSURE COLUMN, WITHDRAWING FORM THE TOP OF THE LAST SAID COLUM THE LOWER BOILING FRACTION AND WITHDRAWING SAID FRACTION IN HEAT EXCHANGE WITH THE INCOMING GASEOUS MIXTURE TO COOL THE SAME AND WITHDRAWING FORM ITS BOTTOM A LIQUID WHICH IS THEN EXPANDED AND USED AS A SCRUBBING LIQUID IN THE LOWER PRESSURE COLUMN.
Claim 2
Independent Claim
159 words
A METHOD FOR LOW TEMPERATURE SEPARATION OF A GASEOUS MIXTURE INTO AT LEAST TWO FRACTIONS HAVING DIFFERENT BOILING POINTS, BY SUCCESSIVE FRACTIONATION, IN TWO RECTIFRICATION COLUMNS OPERATING UNDER DIFFERENT PRESSURES AND PROVIDED WITH A HEAT TRANSFER UNIT ACTING AS A CONDENSER FOR THE TOP OF THE HIGHER PRESSURE COLUMN AND AS A BOILER FOR THE BOTTOM OF THE LOW PRESSURE COLUMN, WHICH COMPRISES, PARTLY LIQUEFYING SAID GASEOUS MIXTURE AND ENTERING IT IN THE LOWER PRESSURE COLUMN, REMOVING FROM THE BOTTOM OF SAID COLUMN THE HIGHER BOILING FRACTION AND FROM ITS TOP A GASEOUS EFFLUENT, COMPRESSING THE WHOLE OF SAID EFFLUENT AND ENTERING IT IN THE HIGHER PRESSURE COLUMN, WITHDRAWING FORM THE TOP OF THE LAST SAID COLUM THE LOWER BOILING FRACTION AND WITHDRAWING SAID FRACTION IN HEAT EXCHANGE WITH THE INCOMING GASEOUS MIXTURE TO COOL THE SAME AND WITHDRAWING FORM ITS BOTTOM A LIQUID WHICH IS THEN EXPANDED AND USED AS A SCRUBBING LIQUID IN THE LOWER PRESSURE COLUMN.
References Cited (Backward Citations)
US2095809A
Cited
US2101300A
Cited
US2409459A
Cited
US2502996A
Cited
US2530602A
Cited
US2567461A
Cited
US2526996A
Cited
US2497589A
Cited
US2502282A
Cited
US2627731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |