US2573349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subscriber signaling system
Assignee: Zenith Electronics LLC
•
Filing: 1949-12-09
•
Granted: 1951-10-30
•
Expires: 1969-12-09
Abstract
No abstract record available.
Inventors
- 👤 Bertrand J Miller
- 👤 George V Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:27
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/162; H04N7/165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1919992A
Cited
US2254378A
Cited
US2370736A
Cited
US2403059A
Cited
US2306654A
Cited
US2393374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |