US3209548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of oxygen-enriched air
Assignee: Air Liquide SA
•
Filing: 1963-02-21
•
Granted: 1965-10-05
•
Expires: 1983-02-21
Abstract
No abstract record available.
Inventors
- 👤 Grunberg Jacques Fred
- 👤 Platt Wayne Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:26
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04624; F25J3/04006; F25J3/04078; F25J3/0409; F25J3/04248; F25J3/04284; F25J3/04309; F25J3/04406; F25J3/04424; F25J2200/00; F25J2200/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A PROCESS FOR THE MANUFACTURE OF OXYGEN-ENRICHED AIR WITH ABOUT 70% OXYGEN COMPRISING THE STEPS OF PRODUCING AN OXYGEN-ENRICHED LIQUID AND GASEOUS NITROGEN UNDER PRESSURE, SEPARATING SAID LIQUID INTO TWO PARTS, INTRODUCING ONE OF SAID PARTS IN A SUBSTANTIALLY LIQUID STATE INTO THE MIDDLE ZONE OF A RECTIFICATION COLUMN, EXPANDING THE SECOND OF SAID PARTS TO ABOUT THE PRESSURE OF SAID RECTIFICATION COLUMN, VAPORIZING SAID SECOND PART BY HEAT EXCHANGE WITH A FIRST PART OF SAID GASEOUS NITROGEN UNDER PRESSURE, WHICH IS THEREBY CONDENSED, AND INTRODUCING THE VAPOR AT THE BOTTOM OF THE RECTIFICATION COLUMN, WITHDRAWING FROM THE BOTTOM OF SAID COLUMN A LIQUID WITH ABOUT 70% OF OXYGEN, EXPANDING AND AT LEAST PARTLY VAPORIZING SAID LIQUID BY HEAT EXCHANGE WITH A SECOND PART OF SAID GASEOUS NITROGEN UNDER PRESSURE, WHICH IS THEREBY CONDENSED, WARMING UP SAID VAPORIZED LIQUID TO ABOUT AMBIENT TEMPERATURE, AND EVACUATING IT UNDER A PRESSURE SLIGHTLY BELOW ATMOSPHERIC.
Claim 2
Dependent Claim
152 words
A PROCESS FOR THE MANUFACTURE OF OXYGEN-ENRICHED AIR WITH ABOUT 70% OXYGEN COMPRISING THE STEPS OF PRODUCING AN OXYGEN-ENRICHED LIQUID AND GASEOUS NITROGEN UNDER PRESSURE, SEPARATING SAID LIQUID INTO TWO PARTS, INTRODUCING ONE OF SAID PARTS IN A SUBSTANTIALLY LIQUID STATE INTO THE MIDDLE ZONE OF A RECTIFICATION COLUMN, EXPANDING THE SECOND OF SAID PARTS TO ABOUT THE PRESSURE OF SAID RECTIFICATION COLUMN, VAPORIZING SAID SECOND PART BY HEAT EXCHANGE WITH A FIRST PART OF SAID GASEOUS NITROGEN UNDER PRESSURE, WHICH IS THEREBY CONDENSED, AND INTRODUCING THE VAPOR AT THE BOTTOM OF THE RECTIFICATION COLUMN, WITHDRAWING FROM THE BOTTOM OF SAID COLUMN A LIQUID WITH ABOUT 70% OF OXYGEN, EXPANDING AND AT LEAST PARTLY VAPORIZING SAID LIQUID BY HEAT EXCHANGE WITH A SECOND PART OF SAID GASEOUS NITROGEN UNDER PRESSURE, WHICH IS THEREBY CONDENSED, WARMING UP SAID VAPORIZED LIQUID TO ABOUT AMBIENT TEMPERATURE, AND EVACUATING IT UNDER A PRESSURE SLIGHTLY BELOW ATMOSPHERIC.
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |