US2668425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removing impurities from a gas liquefaction system with aid of extraneous gas stream
Assignee: MW Kellogg Co
•
Filing: 1951-08-25
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Granted: 1954-02-09
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Expires: 1971-08-25
Abstract
No abstract record available.
Inventors
- 👤 George T Skaperdas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:18
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/08; F25J2210/00; F25J2210/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2048076A
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US2002941A
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US2568223A
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US2433604A
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US2537044A
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US2579498A
Cited
US2504051A
Cited
US2619810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |