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Patent US3423291A successfully refreshed from Google Patents.
US3423291A
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US
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Control of reflux to a fractionator
Assignee: Phillips Petroleum Co
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Filing: 1964-12-14
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Granted: 1969-01-21
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Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Minor W Oglesby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:47
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/4233; Y; Y10; Y10S; Y10S203/00; Y10S203/09; Y10S203/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3158556A
Cited
US3203871A
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US3271270A
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US3165454A
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US3296097A
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US3259734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-21 | 1972-07-22 | 1973-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-21 | 1976-07-22 | 1977-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-21 | 1980-07-22 | 1981-01-21 | $7700.00 | Window Closed / Lapsed |