US2473737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level control in packed towers
Assignee: Phillips Petroleum Co
•
Filing: 1944-03-18
•
Granted: 1949-06-21
•
Expires: 1964-03-18
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Storment
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:42
CPC Classifications
G; G05; G05D; G05D9/00; Y; Y10; Y10S; Y10S203/00; Y10S203/11; Y10S203/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US825746A
Cited
US849210A
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DE421124C
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US1802531A
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US1737490A
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US1864021A
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US1965052A
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US2090691A
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US2170342A
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US2211725A
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US2223658A
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US2277070A
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US2357113A
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US2357664A
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US2388931A
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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) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |