US3022471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tuning filter circuits for increasing ratio of narrow band variable frequency signal to broad band noise
Assignee: Raytheon Co
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Filing: 1961-07-28
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Granted: 1962-02-20
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Expires: 1981-07-28
Abstract
No abstract record available.
Inventors
- 👤 Raymond P Mork
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:36
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0107; H03G; H03G5/00; H03G5/16; H03G5/24; H03G5/26; H03H7/17; H03H7/1708; H03H7/1741; H03H7/1775
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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |