Patent US2954677A successfully refreshed from Google Patents.
US2954677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas liquefaction process
Assignee: Air Liquide SA
•
Filing: 1957-08-12
•
Granted: 1960-10-04
•
Expires: 1977-08-12
Abstract
No abstract record available.
Inventors
- 👤 Simonet Guy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:41
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/08; F25J2200/00; F25J2200/02; F25J2200/76; F25J2205/00; F25J2205/60; F25J2205/86; F25J2215/00; F25J2215/10; F25J2220/00; F25J2220/90; F25J2270/00; F25J2270/04; Y; Y10; Y10S; Y10S62/00; Y10S62/919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS FOR LIQUEFYING HYDROGEN AND SEPARATING IT BY RECTIFICATION UNDER A LOW PRESSURE INTO DEUTERIUMENRICHED HYDROGEN AND DEUTERIUM-DEPLETED HYDROGEN, COMPRISING THE STEPS OF: COMPRESSING A STREAM OF SAID HYDROGEN TO A HIGH PRESSURE, COOLING IT TO A TEMPERATURE ABOVE -175*C. BY HEAT EXCHANGE WITH AN EQUAL MASS FLOW RATE OF A LOW PRESSURE HYDROGEN STREAM ISSUED FROM SAID RECTIFICATION, FURTHER COOLING IT TO ABOUT -175*C. BY HEAT EXCHANGE WITH A SMALLER MASS FLOW RATE OF A LOWPRESSURE HYDROGEN STREAM ISSUED FROM SAID RECTIFICATION, EXPANDING IT WITH EXTERNAL WORK AND RECTIFYING IT, COMPRESSING A STREAM OF WARMED UP DEUTERIUM-DEPLETED HYDROGEN ISSUED FROM SAID RECTIFICATION TO AN INTERMEDIATE PRESSURE, COOLING IT TO A TEMPERATURE ABOVE -175*C. BY HEAT EXCHANGE WITH AN EQUAL MASS FLOW RATE OF A LOWPRESSURE HYDROGEN STREAM ISSUED FROM SAID RECTIFICATION, FURTHER COOLING IT TO A TEMPERATURE UNDER -175*C. BY
Claim 2
Dependent Claim
142 words
A PROCESS FOR LIQUEFYING HYDROGEN AND SEPARATING IT BY RECTIFICATION UNDER A LOW PRESSURE INTO DEUTERIUMENRICHED HYDROGEN AND DEUTERIUM-DEPLETED HYDROGEN, COMPRISING THE STEPS OF: COMPRESSING A STREAM OF SAID HYDROGEN TO A HIGH PRESSURE, COOLING IT TO A TEMPERATURE ABOVE -175*C. BY HEAT EXCHANGE WITH AN EQUAL MASS FLOW RATE OF A LOW PRESSURE HYDROGEN STREAM ISSUED FROM SAID RECTIFICATION, FURTHER COOLING IT TO ABOUT -175*C. BY HEAT EXCHANGE WITH A SMALLER MASS FLOW RATE OF A LOWPRESSURE HYDROGEN STREAM ISSUED FROM SAID RECTIFICATION, EXPANDING IT WITH EXTERNAL WORK AND RECTIFYING IT, COMPRESSING A STREAM OF WARMED UP DEUTERIUM-DEPLETED HYDROGEN ISSUED FROM SAID RECTIFICATION TO AN INTERMEDIATE PRESSURE, COOLING IT TO A TEMPERATURE ABOVE -175*C. BY HEAT EXCHANGE WITH AN EQUAL MASS FLOW RATE OF A LOWPRESSURE HYDROGEN STREAM ISSUED FROM SAID RECTIFICATION, FURTHER COOLING IT TO A TEMPERATURE UNDER -175*C. BY
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) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |