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Patent US2656407A successfully refreshed from Google Patents.
US2656407A
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Subscriber signaling system
Assignee: Zenith Electronics LLC
•
Filing: 1949-02-12
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Granted: 1953-10-20
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Expires: 1969-02-12
Abstract
No abstract record available.
Inventors
- 👤 Roswell H Herrick
- 👤 Erwin M Roschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:25
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/173; H04N7/17345; H04N7/17363; H04N7/162; H04N7/165; H04N2007/1739; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20207; Y10T74/20213; Y10T74/20232
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2286540A
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US2307728A
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US2306435A
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US2301504A
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US2402067A
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US2405252A
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US2403540A
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US2472774A
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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 |