US3418819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquefaction of natural gas by cascade refrigeration
Assignee: Air Liquide SA
•
Filing: 1966-06-16
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Granted: 1968-12-31
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Expires: 1986-06-16
Abstract
No abstract record available.
Inventors
- 👤 Grunberg Jacques Fred
- 👤 Takagi Harumitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:39
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/02; F25J1/0211; F25J1/0219; F25J1/0002; F25J1/0022; F25J1/003; F25J1/0032; F25J1/004; F25J1/0047; F25J1/0052; F25J1/006; F25J1/008; F25J1/0087; F25J1/0243; F25J1/0257; F25J1/0262; F25J1/0264; F25J1/0265; F25J2205/00; F25J2205/02; F25J2210/00; F25J2210/06; F25J2220/00; F25J2220/60; F25J2220/62; F25J2245/00; F25J2245/90; F25J2290/00; F25J2290/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3020723A
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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) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |