Patent US1618173A successfully refreshed from Google Patents.
Patent US3218816A successfully refreshed from Google Patents.
US3218816A
Expired / Lapsed
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Process for cooling a gas mixture to a low temperature
Assignee: Air Liquide SA
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Filing: 1962-05-23
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Granted: 1965-11-23
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Expires: 1982-05-23
Abstract
No abstract record available.
Inventors
- 👤 Grenier Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:23
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0257; C; C07; C07C; C07C7/00; C07C7/09; C08; C08G; C08G77/00; C10; C10G; C10G5/00; C10G5/06; F25J1/00; F25J1/0002; F25J1/0022; F25J1/003; F25J1/0032; F25J1/004; F25J1/0045; F25J1/02; F25J1/0201; F25J1/0202; F25J1/0228; F25J1/0229; F25J1/0231; F25J1/0235; F25J1/0237; F25J1/0243; F25J1/0244; F25J1/0245; F25J1/0249; F25J1/025; F25J1/0257; F25J1/0262; F25J1/0264; F25J1/0265; F25J3/0204; F25J3/0209; F25J3/0233; F25J3/0242; F25J3/0247; F25J2200/00; F25J2200/02; F25J2200/50; F25J2200/70; F25J2200/74; F25J2200/76; F25J2200/80; F25J2205/00; F25J2205/02; F25J2205/04; F25J2215/00; F25J2215/04; F25J2215/64; F25J2215/66; F25J2250/00; F25J2250/20; F25J2290/00; F25J2290/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR LIQUEFYING A GASEOUS FEED MIXTURE AT A RELATIVELY LOW TEMPERATURE, COMPRISING THE STEPS OF: (A) PASSING THE GASEOUS MIXTURE THROUGH A CONDENSING ZONE AT RELATIVELY HIGH TEMPERATURE FORMING A HIGH BOILING POINT LIQUID AND A LOW BOILING POINT GAS; (B) WITHDRAWING THE LOW BOILING POINT GAS FROM THE CONDENSING STEP AND PASSING IT THROUGH A COOLING ZONE TO FORM A SECOND LIQUID FRACTION AND A SECOND GASEOUS FRACTION; (C) WITHDRAWING THE HIGH BOILING LIQUID FROM STEP (A), PASSING AT LEAST PART OF SAID LIQUID THROUGH A COOLING ZONE, EXPANDING SAID PASSED LIQUID TO A LOWER
Claim 2
Dependent Claim
98 words
A PROCESS FOR LIQUEFYING A GASEOUS FEED MIXTURE AT A RELATIVELY LOW TEMPERATURE, COMPRISING THE STEPS OF: (A) PASSING THE GASEOUS MIXTURE THROUGH A CONDENSING ZONE AT RELATIVELY HIGH TEMPERATURE FORMING A HIGH BOILING POINT LIQUID AND A LOW BOILING POINT GAS; (B) WITHDRAWING THE LOW BOILING POINT GAS FROM THE CONDENSING STEP AND PASSING IT THROUGH A COOLING ZONE TO FORM A SECOND LIQUID FRACTION AND A SECOND GASEOUS FRACTION; (C) WITHDRAWING THE HIGH BOILING LIQUID FROM STEP (A), PASSING AT LEAST PART OF SAID LIQUID THROUGH A COOLING ZONE, EXPANDING SAID PASSED LIQUID TO A LOWER
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |