US3616652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for liquefying natural gas containing nitrogen by using cooled expanded and flashed gas therefrom as a coolant therefor
Assignee: Conch International Methane Ltd
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Filing: 1967-09-11
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Granted: 1971-11-02
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Expires: 1987-09-11
Abstract
Abstract A LIQUEFACTION PROCESS FOR NATURAL GAS WHICH THE GAS IS INITIALLY LIQUEFIED AT HIGH PRESSURE, THE LIQUID IS EXPANDED AND COOLED AND THEN FLASHED TO GIVE A LOW PRESSURE LIQUID AND FLASH GAS, AND THE FLASH GAS IS RECIRCULATED TO COOL THE INCOMING GAS AT VARIOUS STAGES OF THE PROCESS. THE RECIRCULATED FLASH GAS CAN BE COOLED BY COMPRESSION AND EXPANSION AND RE-INTRODUCED INTO THE SYSTEM AT VARIOUS POINTS INCLUDING THAT AT WHICH THE LIQUID GAS BEFORE FLASHING IS PRESENT.
Inventors
- 👤 Manfred O Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:49
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/0002; F25J1/0022; F25J1/003; F25J1/0032; F25J1/0035; F25J1/0037; F25J1/004; F25J1/0042; F25J1/02; F25J1/0201; F25J1/0202; F25J1/0243; F25J1/0244; F25J1/0245; F25J1/0247; F25J1/0257; F25J1/0262; F25J1/0264; F25J2210/00; F25J2210/06; F25J2230/00; F25J2230/30; F25J2240/00; F25J2240/40; F25J2270/00; F25J2270/04; F25J2270/06
Claims Analysis
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |