US2656410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subscriber signaling system
Assignee: Zenith Electronics LLC
•
Filing: 1950-02-07
•
Granted: 1953-10-20
•
Expires: 1970-02-07
Abstract
No abstract record available.
Inventors
- 👤 Roswell H Herrick
- 👤 Erwin M Roschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:35
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/162; H04N7/165; H04N7/173; H04N7/17345; H04N7/17363; H04N2007/1739
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1369805A
Cited
US2251525A
Cited
US2403059A
Cited
US2465367A
Cited
US2403540A
Cited
US2521010A
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 |