US2394220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Level control and indicator of interface between acid and hydrocarbon layers
Assignee: Phillips Petroleum Co
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Filing: 1944-05-19
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Granted: 1946-02-05
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Expires: 1964-05-19
Abstract
No abstract record available.
Inventors
- 👤 Cary R Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:50
CPC Classifications
G; G05; G05D; G05D9/00; G05D9/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3006; Y10T137/3009; Y10T137/3012; Y10T137/3021; Y10T137/304; Y10T137/3052; Y10T137/7287; Y10T137/7306; Y10T137/8158; Y10T137/8342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-02-04 | 1949-08-06 | 1950-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-02-04 | 1953-08-06 | 1954-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-02-04 | 1957-08-06 | 1958-02-05 | $7700.00 | Window Closed / Lapsed |