US3609984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing liquefied hydrogen,helium and neon
Assignee: Individual
•
Filing: 1969-04-25
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Granted: 1971-10-05
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Expires: 1989-04-25
Abstract
Abstract A PROCESS FOR LIQUEFYING HYDROGEN, HELIUM AND NEON MORE EFFICIENTLY AND ECONOMICALLY THAN BY METHODS PREVIOUSLY PRACTICED, WHICH PROCESS INCLUDES THE STEPS OF COMPRESSING THE GAS (HYDROGEN, HELIUM OR NEON) TO A PRESSURE SUCH THAT, UPON ISOBARICALLY COOLING THE THUS COMPRESSED GAS, A TEMPERATURE ABOVE THE CRTITCAL TEMPERATURE OF THE GAS IS REACHED AT WHICH THE GAS CAN BE ISENTRIOPICALLY EXPANDED TO YIELD SUBSTANTIALLY A SINGLE LIQUID PHASE AT ATMOSPHERIC PRESSURE; THEN ISOBARICALLY COOLING THE GAS AT THIS PRESSURE TO SUCH TEMPERATURE; AND FINALLY ISENTROPICALLY EXPANDING THE GAS TO SUBSTANTIALLY ATMOSPHERIC PRESSURE THROUGH A WORK ENGINE.
Inventors
- 👤 Leo Garwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:25
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0203; F25J1/0205; F25J1/0002; F25J1/0005; F25J1/0007; F25J1/001; F25J1/003; F25J1/0032; F25J1/0042; F25J1/0047; F25J1/005; F25J1/0052; F25J1/006; F25J1/0062; F25J1/0065; F25J2215/00; F25J2215/32; F25J2270/00; F25J2270/14; F25J2270/16; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/931; Y10S62/933
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |