US2653221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppressed carrier radio communication system
Assignee: Zenith Electronics LLC
•
Filing: 1949-12-01
•
Granted: 1953-09-22
•
Expires: 1969-12-01
Abstract
No abstract record available.
Inventors
- 👤 Chalon W Carnahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:04
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/002; H04B14/006; H04B1/00; H04B1/68; H04B14/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2237522A
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US2445618A
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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) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |