Patent FR752537A successfully refreshed from Google Patents.
US3343374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid nitrogen production
Assignee: Conch International Methane Ltd
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Filing: 1965-09-02
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Granted: 1967-09-26
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Expires: 1985-09-02
Abstract
No abstract record available.
Inventors
- 👤 Warren L Nelson
- 👤 Kositsky Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:36
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0243; F25J1/0279; F25J1/0292; F17; F17C; F17C9/00; F17C9/02; F17C9/04; F25J1/0002; F25J1/0012; F25J1/0015; F25J1/003; F25J1/0032; F25J1/004; F25J1/0221; F25J1/0224; F17C2265/00; F17C2265/05; F25J2205/00; F25J2205/60; F25J2205/84; F25J2210/00; F25J2210/62; F25J2230/00; F25J2230/60; F25J2235/00; F25J2235/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A METHOD OF LIQUEFYING A GAS FROM THE GROUP CONSISTING OF NITROGEN AND OXYGEN UTILIZING A LIQUID REFRIGERANT OF A TYPE HAVING A BOILING POINT, AT A CONVENIENT PRESSURE, LOWER THAN THE CRITICAL TEMPERATURE OF SAID GAS, SAID METHOD COMPRISING (A) INTRODUCING A MAIN STREAM OF SAID GAS AT A SELECTED PRESSURE, (B) LIQUEFYING SAID GAS BY INDIRECT HEAT EXCHANGE WITH SAID LIQUID REFRIGERANT. (C) EXPANDING A PORTION OF SAID LIQUEFIED GAS IN A PLURALITY OF SUCCESSIVE STAGES TO FORM A PLURALITY OF INDIVIDUAL GASEOUS RECYCLE STREAMS, EACH RECYCLE STREAM BEING OF LESSER PRESSURE THAN THE PRECEEDING RECYCLE STREAM, (D) COMPRESSING EACH RECYCLE STREAM TO THE PRESSURE OF (E) REMOVING THE HEAT OF COMPRESSION GENERATED BY SAID STEP (D) BY INDIRECT HEAT EXCHANGE BETWEEN SUCH COMPRESSED RECYCLE STREAM AND SAID LIQUID REFRIGERANT, (F) COMBINING SUCH COMPRESSED AND COOLED RECYCLE STREAM WITH THE PRECEDING RECYCLE STREAM PRIOR TO COMPRESSION OF THE LATTER. (G) AND FEEDING SAID COMBINED RECYCLE STREAMS AT SAID SELECTED PRESSURE INTO SAID MAIN STREAM PRIOR TO ITS LIQUEFACTION IN SAID STEP (B).
Claim 2
Independent Claim
174 words
A METHOD OF LIQUEFYING A GAS FROM THE GROUP CONSISTING OF NITROGEN AND OXYGEN UTILIZING A LIQUID REFRIGERANT OF A TYPE HAVING A BOILING POINT, AT A CONVENIENT PRESSURE, LOWER THAN THE CRITICAL TEMPERATURE OF SAID GAS, SAID METHOD COMPRISING (A) INTRODUCING A MAIN STREAM OF SAID GAS AT A SELECTED PRESSURE, (B) LIQUEFYING SAID GAS BY INDIRECT HEAT EXCHANGE WITH SAID LIQUID REFRIGERANT. (C) EXPANDING A PORTION OF SAID LIQUEFIED GAS IN A PLURALITY OF SUCCESSIVE STAGES TO FORM A PLURALITY OF INDIVIDUAL GASEOUS RECYCLE STREAMS, EACH RECYCLE STREAM BEING OF LESSER PRESSURE THAN THE PRECEEDING RECYCLE STREAM, (D) COMPRESSING EACH RECYCLE STREAM TO THE PRESSURE OF (E) REMOVING THE HEAT OF COMPRESSION GENERATED BY SAID STEP (D) BY INDIRECT HEAT EXCHANGE BETWEEN SUCH COMPRESSED RECYCLE STREAM AND SAID LIQUID REFRIGERANT, (F) COMBINING SUCH COMPRESSED AND COOLED RECYCLE STREAM WITH THE PRECEDING RECYCLE STREAM PRIOR TO COMPRESSION OF THE LATTER. (G) AND FEEDING SAID COMBINED RECYCLE STREAMS AT SAID SELECTED PRESSURE INTO SAID MAIN STREAM PRIOR TO ITS LIQUEFACTION IN SAID STEP (B).
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) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |