US2653455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cold separation of gaseous mixtures
Assignee: Air Liquide SA
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Filing: 1950-12-15
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Granted: 1953-09-29
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Expires: 1970-12-15
Abstract
No abstract record available.
Inventors
- 👤 Etienne Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J5/00; F25J2210/00; F25J2210/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2534478A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-28 | 1957-03-30 | 1957-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-28 | 1961-03-30 | 1961-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-28 | 1965-03-30 | 1965-09-29 | $7700.00 | Window Closed / Lapsed |