US2659813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation repeater
Assignee: AT&T Inc
•
Filing: 1950-02-11
•
Granted: 1953-11-17
•
Expires: 1970-02-11
Abstract
No abstract record available.
Inventors
- 👤 John C Schelleng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:18
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2296962A
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US2250104A
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US2296919A
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US2347459A
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US2407212A
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US2501368A
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US2424830A
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US2481902A
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US2550519A
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US2477428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |