US2873583A
Expired / Lapsed
US
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Dual pressure cycle for air separation
Assignee: Union Carbide Corp
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Filing: 1954-05-04
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Granted: 1959-02-17
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Expires: 1974-05-04
Abstract
No abstract record available.
Inventors
- 👤 Lawrence D Potts
- 👤 Edward F Yendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:14
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J3/04187; F25J3/04193; F25J3/04206; F25J3/04006; F25J3/04048; F25J3/04066; F25J3/04078; F25J3/0409; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04303; F25J3/04375; F25J3/04393; F25J3/04406; F25J3/04412; F25J3/04763; F25J3/04769; F25J3/04812; H; H05; H05B; H05B3/00; H05B3/78; H05B3/82; F25J2200/00; F25J2200/50; F25J2200/52; F25J2200/90; F25J2200/94; F25J2205/00; F25J2205/24; F25J2215/00; F25J2215/50; F25J2215/52; F25J2245/00; F25J2245/40; F25J2250/00; F25J2250/20; F25J2250/30; F25J2250/40; F25J2250/50
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) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |