Patent US2504464A successfully refreshed from Google Patents.
US2504464A
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US
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Method for control of distillation columns
Assignee: Phillips Petroleum Co
•
Filing: 1946-02-04
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Granted: 1950-04-18
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Expires: 1966-02-04
Abstract
No abstract record available.
Inventors
- 👤 Clyde P Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:27
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US79260A
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US1828691A
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US2236035A
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US2277070A
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US2281282A
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US2297098A
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US2364341A
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US2404499A
Cited
US2414371A
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US2396723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |