US2512637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppression circuit
Assignee: United States, WAR, Secretary of
•
Filing: 1945-08-10
•
Granted: 1950-06-27
•
Expires: 1965-08-10
Abstract
No abstract record available.
Inventors
- 👤 Richard E Frazier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:05
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1754557A
Cited
US2088210A
Cited
US2171671A
Cited
US2224794A
Cited
US2290553A
Cited
US2342238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |