US3407398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid presence detector
Assignee: BP PLC
•
Filing: 1965-01-05
•
Granted: 1968-10-22
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Expires: 1985-01-05
Abstract
No abstract record available.
Inventors
- 👤 Stearn Richard John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:49
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; G01F23/2961; G01F23/2965; G01V; G01V1/00; G01V1/001; Y; Y10; Y10S; Y10S367/00; Y10S367/908
Claims Analysis
Total Claims: 0
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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) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |