US3418561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid-state filter circuit
Assignee: United States Department of the Army
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Filing: 1967-01-06
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Granted: 1968-12-24
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Expires: 1987-01-06
Abstract
No abstract record available.
Inventors
- 👤 Nathan W Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:47
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/46; H02; H02M; H02M1/00; H02M1/14; H02M1/15; H03H11/02; H03H11/04; H03H11/0405
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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |