US2656409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subscriber signaling system
Assignee: Zenith Electronics LLC
•
Filing: 1950-01-12
•
Granted: 1953-10-20
•
Expires: 1970-01-12
Abstract
No abstract record available.
Inventors
- 👤 George V Morris
- 👤 Bertrand J Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:42
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167; H04N7/169; H04N7/1693
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1633678A
Cited
US1809070A
Cited
US1844111A
Cited
US2141463A
Cited
US2566330A
Cited
US2547598A
Cited
US2570209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |