Patent US2685181A successfully refreshed from Google Patents.
US2685181A
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Separation of the constituents of gaseous mixtures
Assignee: Airco Inc
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Filing: 1952-04-30
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Granted: 1954-08-03
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Expires: 1972-04-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:23
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/044; F25J3/04151; F25J3/04187; F25J3/04218; F25J3/04224; F25J3/04248; F25J3/04254; F25J3/0426; F25J3/04333; F25J3/04351; F25J2200/00; F25J2200/74; F25J2200/76; F25J2210/00; F25J2210/50; F25J2280/00; F25J2280/02; Y; Y10; Y10S; Y10S62/00; Y10S62/912; Y10S62/913
Claims Analysis
Total Claims: 0
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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) | 1957-08-02 | 1958-02-01 | 1958-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-02 | 1962-02-01 | 1962-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-02 | 1966-02-01 | 1966-08-03 | $7700.00 | Window Closed / Lapsed |