US2680228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optimum filter for detecting and differentiating complex signals
Assignee: United States Department of the Air Force
•
Filing: 1952-06-27
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Granted: 1954-06-01
•
Expires: 1972-06-27
Abstract
No abstract record available.
Inventors
- 👤 Caldwell P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:48
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; G; G10; G10L; G10L19/00; G10L19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2323609A
Cited
US2429229A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |