Low temperature refrigeration
Abstract
Abstract 860,723. Liquefaction of gases. CONCH INTERNATIONAL METHANE Ltd. Aug. 31, 1959, No. 29696/59. Class 8(2). Liquefaction of a first gas e.g. methane by heat exchange with a colder second gas of lower boiling point, e.g. nitrogen is effected by passing compressed methane through passages 22, 16, 10 of series arranged heat exchangers 6, 4, 2 in countercurrent to pressurized liquid nitrogen forced by a pump 28 through passages 8, 14, 20 and also in countercurrent to nitrogen gas exhausted from the passage 20 of exchanger 6 after expansion and consequent cooling in a turbine 36 and traversing passages 12, 18 of exchangers 4, 6. As shown the mass flow rates of the methane and nitrogen are equal and the extra cold requirement is met by an external refrigerator 26 driven by the turbine 36 and exhausting through a passage 24 in exchanger 6.
Inventors
- 👤 Philip E Bocquet
- 👤 Shao E Tung
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |