US3214925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for gas separation by rectification at low temperatures
Assignee: Linde GmbH
•
Filing: 1961-08-10
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Granted: 1965-11-02
•
Expires: 1981-08-10
Abstract
No abstract record available.
Inventors
- 👤 Becker Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:59
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04006; F25J3/04078; F25J3/0409; F25J3/04151; F25J3/04187; F25J3/04193; F25J3/04206; F25J3/04303; F25J3/04375; F25J3/04393; F25J3/04406; F25J3/04412; F25J2205/00; F25J2205/02; F25J2205/04; F25J2205/24; F25J2250/00; F25J2250/30; F25J2250/40; F25J2250/50; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A PROCESS FOR SEPARATING A GASEOUS FEED MIXTURE INTO ITS SEPARATION PRTODUCTS BY LOW TEMPERATURE RECTIFICATION, WHEREIN A SEPARATION PRODUCT IS RECOVERED FROM THE RECTIFYING ZONE IN THE LIQUID PHASE AND SAID PRODUCT IS COMPRESSED TO A PREDETERMINED HIGHER FINAL PRESSURE, THE IMPROVEMENT WHICH COMPRISES COMPRESSING, COOLING AND CLEANING SAID GASEOUS FEED; HETING TO AMBIENT TEMPERATURE AND FURTHER COMPRESSING AT LEAST A PART OF SAID GASEOUS FEED MIXTURE TO A PRESSURE BETWEEN 6 AND 18 ATMOSPHERES; PUMPING SAID LIQUID PRODUCT FROM SAID RECTIFICATION ZONE TO AN INTERMEDIATE PRESSURE BELOW SAID PREDETERMINED FINAL PRESSURE TO OBTAIN AN INTERMEDIATEPRESSURE LIQUID; PASSING SAID INTERMEDIATE-PRESSURE LIQUID IN HEAT EXCHANGE RELATION WITH AT LEAST A PART OF SAID GASEOUS FEED MIXTURE WHICH HAS PREVIOUSLY BEEN COMPRESSED AND COOLED; SAID INTERMEDIATE PRESSURE BEING SUCH AS TO CAUSE THE SAID INTERMEDIATE-PRESSURE LIQUID TO BE
Claim 2
Dependent Claim
138 words
IN A PROCESS FOR SEPARATING A GASEOUS FEED MIXTURE INTO ITS SEPARATION PRTODUCTS BY LOW TEMPERATURE RECTIFICATION, WHEREIN A SEPARATION PRODUCT IS RECOVERED FROM THE RECTIFYING ZONE IN THE LIQUID PHASE AND SAID PRODUCT IS COMPRESSED TO A PREDETERMINED HIGHER FINAL PRESSURE, THE IMPROVEMENT WHICH COMPRISES COMPRESSING, COOLING AND CLEANING SAID GASEOUS FEED; HETING TO AMBIENT TEMPERATURE AND FURTHER COMPRESSING AT LEAST A PART OF SAID GASEOUS FEED MIXTURE TO A PRESSURE BETWEEN 6 AND 18 ATMOSPHERES; PUMPING SAID LIQUID PRODUCT FROM SAID RECTIFICATION ZONE TO AN INTERMEDIATE PRESSURE BELOW SAID PREDETERMINED FINAL PRESSURE TO OBTAIN AN INTERMEDIATEPRESSURE LIQUID; PASSING SAID INTERMEDIATE-PRESSURE LIQUID IN HEAT EXCHANGE RELATION WITH AT LEAST A PART OF SAID GASEOUS FEED MIXTURE WHICH HAS PREVIOUSLY BEEN COMPRESSED AND COOLED; SAID INTERMEDIATE PRESSURE BEING SUCH AS TO CAUSE THE SAID INTERMEDIATE-PRESSURE LIQUID TO BE
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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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |