US2908144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for separating gas mixtures
Assignee: Union Carbide Corp
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Filing: 1956-01-04
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Granted: 1959-10-13
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Expires: 1976-01-04
Abstract
No abstract record available.
Inventors
- 👤 Vincent E First
- 👤 Lawrence D Potts
- 👤 Philip K Rice
- 👤 Edward F Yendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:02
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04254; F25J3/04333; F25J3/04363; F25J3/04406; F25J3/04412; F25J2200/00; F25J2200/40; F25J2205/00; F25J2205/24; F25J2210/00; F25J2210/50; F25J2230/00; F25J2230/50; F25J2235/00; F25J2235/50; F25J2245/00; F25J2245/50; F25J2245/90; F25J2250/00; F25J2250/30; F25J2250/50; F25J2290/00; F25J2290/62; Y; Y10; Y10S; Y10S62/00; Y10S62/912; Y10S62/913
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |