Patent US2640269A successfully refreshed from Google Patents.
US2640269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level indicator
Assignee: Phillips Petroleum Co
•
Filing: 1949-12-30
•
Granted: 1953-06-02
•
Expires: 1969-12-30
Abstract
No abstract record available.
Inventors
- 👤 Charles L Seefluth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:44
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/30; G01F23/64; G01F23/66; G01F23/665
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |