Patent US3401531A successfully refreshed from Google Patents.
US3401531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchange of compressed nitrogen and liquid oxygen in ammonia synthesis feed gas production
Assignee: Linde GmbH
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Filing: 1966-05-17
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Granted: 1968-09-17
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Expires: 1986-05-17
Abstract
No abstract record available.
Inventors
- 👤 Kessler Godehard
- 👤 Scholz Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:30
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04521; F25J3/04612; F25J3/0204; F25J3/0219; F25J3/0223; F25J3/0228; F25J3/0276; F25J3/04006; F25J3/04078; F25J3/0409; F25J3/04248; F25J3/04333; F25J3/04351; F25J3/04406; F25J3/04412; F25J3/04563; F25J3/04587; F25J2200/00; F25J2200/80; F25J2205/00; F25J2205/30; F25J2210/00; F25J2210/12; F25J2210/42; F25J2260/00; F25J2260/02; F25J2270/00; F25J2270/42; Y; Y10; Y10S; Y10S62/00; Y10S62/931; Y10S62/934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
AN INTEGRATED PROCESS FOR THE LOW TEMPERATURE SEPARATION OF AIR INTO NITROGEN AND HIGH PRESSURE OXYGEN AND THE SEPARATION OF A HYDROGEN-CONTAINING GASEOUS MIXTURE INTO ENRICHED HYDROGEN, THE STEPS OF: (A) WITHDRAWING NITROGEN FROM AN AIR RECTIFICATION COLUMN AND COMPRESSING AT LEAST A PORTION OF SAID NITROGEN TO A HIGH PRESSURE; (C) WITHDWARING LIQUID OXYGEN FROM SAID AIR RECTIFICATION COLUMN AND COMPRESSING SAME IN THE LIQUID PHASE TO A HIGH PRESSURE; (C) PASSING AT LEAST A PORTION OF RESULTANT HIGH PRESSURE GASEOUS NITROGEN INTO HEAT EXCHANGE RELATIONSHIP WITH RESULTANT HIGH PRESSURE LIQUID OXYGEN AND VAPORIZING SAID LIQUID OXYGEN WHILE COOLING SAID GASEOUS NITROGEN; (D) LIQUEFYING RESULTANT COOLED GASEOUS NITROGEN; AND (E) PASSING RESULTANT LIQUID NITROGEN INTO THE TOP OF A SCRUBBING COLUMN IN DIRECT COUNTERCURRENT CONTACT WITH ASCENDING HYDROGEN-CONTAINING GASEOUS MIXTURE.
Claim 2
Dependent Claim
131 words
AN INTEGRATED PROCESS FOR THE LOW TEMPERATURE SEPARATION OF AIR INTO NITROGEN AND HIGH PRESSURE OXYGEN AND THE SEPARATION OF A HYDROGEN-CONTAINING GASEOUS MIXTURE INTO ENRICHED HYDROGEN, THE STEPS OF: (A) WITHDRAWING NITROGEN FROM AN AIR RECTIFICATION COLUMN AND COMPRESSING AT LEAST A PORTION OF SAID NITROGEN TO A HIGH PRESSURE; (C) WITHDWARING LIQUID OXYGEN FROM SAID AIR RECTIFICATION COLUMN AND COMPRESSING SAME IN THE LIQUID PHASE TO A HIGH PRESSURE; (C) PASSING AT LEAST A PORTION OF RESULTANT HIGH PRESSURE GASEOUS NITROGEN INTO HEAT EXCHANGE RELATIONSHIP WITH RESULTANT HIGH PRESSURE LIQUID OXYGEN AND VAPORIZING SAID LIQUID OXYGEN WHILE COOLING SAID GASEOUS NITROGEN; (D) LIQUEFYING RESULTANT COOLED GASEOUS NITROGEN; AND (E) PASSING RESULTANT LIQUID NITROGEN INTO THE TOP OF A SCRUBBING COLUMN IN DIRECT COUNTERCURRENT CONTACT WITH ASCENDING HYDROGEN-CONTAINING GASEOUS MIXTURE.
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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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |