US2787453A
Expired / Lapsed
US
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Fractionating tower utilizing directional upflow means in conjunction with slanted trays
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1953-11-30
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Granted: 1957-04-02
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Expires: 1973-11-30
Abstract
No abstract record available.
Inventors
- 👤 Henry J Hibshman
- 👤 Stephen H Dole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:08
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/16; B01D3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR1048712A
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US2681219A
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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) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |