US2784572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for fractionating air by liquefaction and rectification
Assignee: Linde GmbH
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Filing: 1955-06-03
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Granted: 1957-03-12
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Expires: 1975-06-03
Abstract
No abstract record available.
Inventors
- 👤 Wucherer Johannes
- 👤 Becker Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:36
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04284; F25J3/04327; F25J3/04006; F25J3/04078; F25J3/0409; F25J3/04406; F25J3/04412; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/04666; F25J3/04672; F25J2205/00; F25J2205/24; F25J2250/00; F25J2250/30; F25J2250/40; F25J2250/58; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR FRACTIONATING AIR COMPRISING THE STEPS OF COMPRESSING THE AIR TO BE FRACTIONATED, INDIRECTLY COOLING AND THEREBY LIQUEFYING AT LEAST A PART OF THE AIR BY INDIRECT HEAT EXCHANGE WITH EVAPORATING ARGON, SEPARATING THE OXYGEN IN THE AIR IN A RECTIFIER, COMPRESSING THE SEPARATED LIQUID OXYGEN, EVAPORATING AND HEATING THE COMPRESSED OXYGEN TO AMBIENT TEMERATURE BY INDIRECT HEAT EXCHANGE WITH ARGON CIRCULATING IN ONE CLOSED CIRCUIT IN WHICH THE ARGON IS COMPRESSED, THE COMPRESSED ARGON BEING COOLED AND LIQUEFIED BY THE AFORESAID INDIRECT HEAT EXCHANGE WITH THE COMPRESSED LIQUIDAND EVAPORATING OXYGEN, THE COMPRESSED AND COOLED ARGON BEING EXPANDED AND EVAPORATED BY THE AFORESAID HEAT EXCHANGE WITH THE COMPRESSED AIR PRIOR TO THE COMPRESSION OF THE ARGON.
Claim 2
Dependent Claim
118 words
A PROCESS FOR FRACTIONATING AIR COMPRISING THE STEPS OF COMPRESSING THE AIR TO BE FRACTIONATED, INDIRECTLY COOLING AND THEREBY LIQUEFYING AT LEAST A PART OF THE AIR BY INDIRECT HEAT EXCHANGE WITH EVAPORATING ARGON, SEPARATING THE OXYGEN IN THE AIR IN A RECTIFIER, COMPRESSING THE SEPARATED LIQUID OXYGEN, EVAPORATING AND HEATING THE COMPRESSED OXYGEN TO AMBIENT TEMERATURE BY INDIRECT HEAT EXCHANGE WITH ARGON CIRCULATING IN ONE CLOSED CIRCUIT IN WHICH THE ARGON IS COMPRESSED, THE COMPRESSED ARGON BEING COOLED AND LIQUEFIED BY THE AFORESAID INDIRECT HEAT EXCHANGE WITH THE COMPRESSED LIQUIDAND EVAPORATING OXYGEN, THE COMPRESSED AND COOLED ARGON BEING EXPANDED AND EVAPORATED BY THE AFORESAID HEAT EXCHANGE WITH THE COMPRESSED AIR PRIOR TO THE COMPRESSION OF THE ARGON.
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) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |