US3511580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid metal column interface position detector
Assignee: Raytheon Co
•
Filing: 1967-11-30
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Granted: 1970-05-12
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Expires: 1987-11-30
Abstract
No abstract record available.
Inventors
- 👤 Wilfried O Eckhardt
- 👤 Harry J King
- 👤 Joe M Simpkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:07
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/26; G01F23/261; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7306
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) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |