US3375451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive tracking notch filter system
Assignee: National Aeronautics and Space Administration
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Filing: 1965-06-17
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Granted: 1968-03-26
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Expires: 1985-06-17
Abstract
No abstract record available.
Inventors
- 👤 Michael T Borelli
- 👤 Harry J Daniels
- 👤 Hans H Hosenthien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:27
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04
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) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |