US3427228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of flooding in a distillation column by control of column top pressure
Assignee: Phillips Petroleum Co
•
Filing: 1965-12-27
•
Granted: 1969-02-11
•
Expires: 1985-12-27
Abstract
No abstract record available.
Inventors
- 👤 George J Constantikes
- 👤 Robert D Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:33
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/4216; Y; Y10; Y10S; Y10S203/00; Y10S203/19; Y10S62/00; Y10S62/902; Y10S62/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2467951A
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US2915462A
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US3208230A
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US3139391A
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US3130027A
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US3259554A
Cited
US3322136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |