US2425020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference reducing radio system
Assignee: STC PLC
•
Filing: 1943-04-16
•
Granted: 1947-08-05
•
Expires: 1963-04-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Norman H Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:30
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1476721A
Cited
US1889293A
Cited
US2007809A
Cited
FR768022A
Cited
US2226459A
Cited
US2175847A
Cited
US2292100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-04 | 1951-02-03 | 1951-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-04 | 1955-02-03 | 1955-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-04 | 1959-02-03 | 1959-08-05 | $7700.00 | Window Closed / Lapsed |