US2492795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency shift signaling system
Assignee: RCA Corp
•
Filing: 1946-01-29
•
Granted: 1949-12-27
•
Expires: 1966-01-29
Abstract
No abstract record available.
Inventors
- 👤 Hallan E Goldstine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:10
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/38; H04N5/40; H04L; H04L25/00; H04L25/38; H04L25/40; H04L27/00; H04L27/10; H04L27/12; H04N1/00; H04N1/00095; H04N1/00103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2054883A
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US2279659A
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US2176168A
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US2285044A
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US2403358A
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US2379614A
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US2351193A
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US2339608A
Cited
US2401629A
Cited
US2398793A
Cited
US2380959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |