US2513306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing oxygen by the liquefaction and rectification of air
Assignee: Hydrocarbon Research Inc
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Filing: 1947-11-01
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Granted: 1950-07-04
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Expires: 1967-11-01
Abstract
No abstract record available.
Inventors
- 👤 Paul W Garbo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:39
CPC Classifications
F; F25; F25J; F25J5/00; F25J3/00; F25J3/02; F25J3/04; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A PROCESS FOR PRODUCING OXYGEN BY THE LIQUEFACTION AND RECTIFICATION OF AIR, WHICH COMPRISES PASSING STREAMS OF NITROGEN AND OXYGEN RECTIFICATION PRODUCTS THROUGH NITROGEN AND OXYGEN FLOW PATHS RESPECTIVELY IN A HEAT EXCHANGE ZONE, PASSING A STREAM OF AIR THROUGH ANOTHER PATH IN SAID HEAT EXCHANGE ZONE TO RECOVER THE COLD CONTENT OF THE NITROGEN AND OXYGEN RECTIFICATION PRODUCTS, COOLING THE AIR TO A TEMPERATURE CLOSE TO ITS CONDENSATION POINT AT THE PRESSURE PREVAILING IN ITS FLOW PATH THROUGH SAID HEAT EXCHANGE ZONE AND EFFECTING SUBSTANTIALLY COMPLETE REMOVAL OF CARBON DIOXIDE FROM THE AIR IN ITS PASSAGE THROUGH SAID HEAT EXCHANGE ZONE, SUBJECTING THE THUS COOLED AIR TO RECTIFICATION TO PRODUCE SAID OXYGEN AND NITROGEN RECTIFICATION PRODUCTS AND ALSO AN ADDITIONAL RECTIFICATION PRODUCT, PERIODICALLY REVERSING THE FLOW OF AIR AND NITROGEN THROUGH THEIR RESPECTIVE PATHS IN SAID HEAT EXCHANGE ZONE, WHEREBY UPON EACH OF SAID REVERSALS THE NITROGEN SUBSTANTIALLY COMPLETELY REMOVES THE CARBON DIOXIDE DEPOSITED DURING THE PRECEDING STEP OF THE PROCESS IN THE PATH THROUGH WHICH THE NITROGEN FLOWS, PASSING THE STREAM OF SAID ADDITIONAL RECTIFICATION PRODUCT THROUGH A PATH EXTENDING THROUGH AT LEAST THE COLDER PORTION OF SAID HEAT EXCHANGE ZONE IN INDIRECT HEAT EXCHANGE RELATION WITH THE AIR AND
Claim 2
Dependent Claim
202 words
A PROCESS FOR PRODUCING OXYGEN BY THE LIQUEFACTION AND RECTIFICATION OF AIR, WHICH COMPRISES PASSING STREAMS OF NITROGEN AND OXYGEN RECTIFICATION PRODUCTS THROUGH NITROGEN AND OXYGEN FLOW PATHS RESPECTIVELY IN A HEAT EXCHANGE ZONE, PASSING A STREAM OF AIR THROUGH ANOTHER PATH IN SAID HEAT EXCHANGE ZONE TO RECOVER THE COLD CONTENT OF THE NITROGEN AND OXYGEN RECTIFICATION PRODUCTS, COOLING THE AIR TO A TEMPERATURE CLOSE TO ITS CONDENSATION POINT AT THE PRESSURE PREVAILING IN ITS FLOW PATH THROUGH SAID HEAT EXCHANGE ZONE AND EFFECTING SUBSTANTIALLY COMPLETE REMOVAL OF CARBON DIOXIDE FROM THE AIR IN ITS PASSAGE THROUGH SAID HEAT EXCHANGE ZONE, SUBJECTING THE THUS COOLED AIR TO RECTIFICATION TO PRODUCE SAID OXYGEN AND NITROGEN RECTIFICATION PRODUCTS AND ALSO AN ADDITIONAL RECTIFICATION PRODUCT, PERIODICALLY REVERSING THE FLOW OF AIR AND NITROGEN THROUGH THEIR RESPECTIVE PATHS IN SAID HEAT EXCHANGE ZONE, WHEREBY UPON EACH OF SAID REVERSALS THE NITROGEN SUBSTANTIALLY COMPLETELY REMOVES THE CARBON DIOXIDE DEPOSITED DURING THE PRECEDING STEP OF THE PROCESS IN THE PATH THROUGH WHICH THE NITROGEN FLOWS, PASSING THE STREAM OF SAID ADDITIONAL RECTIFICATION PRODUCT THROUGH A PATH EXTENDING THROUGH AT LEAST THE COLDER PORTION OF SAID HEAT EXCHANGE ZONE IN INDIRECT HEAT EXCHANGE RELATION WITH THE AIR AND
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |