US2996891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Natural gas liquefaction cycle
Assignee: Conch International Methane Ltd
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Filing: 1957-09-23
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Granted: 1961-08-22
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Expires: 1977-09-23
Abstract
No abstract record available.
Inventors
- 👤 Shao E Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:48
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/0266; F25J1/00; F25J1/0002; F25J1/0022; F25J1/0027; F25J1/003; F25J1/0032; F25J1/0035; F25J1/004; F25J1/0047; F25J1/0052; F25J1/006; F25J1/008; F25J1/0085; F25J1/0087; F25J1/02; F25J1/0203; F25J1/0208; F25J1/0209; F25J1/021; F25J1/0243; F25J1/0244; F25J1/0254; F25J1/0255; F25J3/0204; F25J3/0209; F25J3/0233; F25J3/0242; F25J2200/00; F25J2200/70; F25J2205/00; F25J2205/02; F25J2205/04; F25J2205/20; F25J2205/24; F25J2205/50; F25J2220/00; F25J2220/60; F25J2220/66; F25J2240/00; F25J2240/02; F25J2270/00; F25J2270/12; F25J2270/60; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US668197A
Cited
US2022165A
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US2500129A
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US2777299A
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US2863296A
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US2826266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |