US2692484A
Expired / Lapsed
US
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Separation of gaseous mixtures
Assignee: Air Liquide SA
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Filing: 1951-04-04
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Granted: 1954-10-26
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Expires: 1971-04-04
Abstract
No abstract record available.
Inventors
- 👤 Etienne Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:33
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0204; F25J3/0209; F25J3/0219; F25J3/0228; F25J3/0233; F25J3/0238; F25J3/0257; F25J2200/00; F25J2200/02; F25J2200/40; F25J2200/50; F25J2200/74; F25J2210/00; F25J2210/12; F25J2210/14; F25J2215/00; F25J2215/62; F25J2240/00; F25J2240/02; F25J2240/12; F25J2270/00; F25J2270/02; F25J2270/04; F25J2270/06; F25J2270/12; F25J2270/42; F25J2270/88; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/91
Claims Analysis
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-25 | 1958-04-26 | 1958-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-25 | 1962-04-26 | 1962-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-25 | 1966-04-26 | 1966-10-26 | $7700.00 | Window Closed / Lapsed |