Patent US2191765A successfully refreshed from Google Patents.
US2270899A
Expired / Lapsed
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Frequency modulation system
Assignee: General Electric Co
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Filing: 1938-11-12
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Granted: 1942-01-27
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Expires: 1958-11-12
Abstract
No abstract record available.
Inventors
- 👤 Roder Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:01
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/02; H04B; H04B14/00; H04B14/002; H04B14/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-01-26 | 1945-07-28 | 1946-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-01-26 | 1949-07-28 | 1950-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-01-26 | 1953-07-28 | 1954-01-27 | $7700.00 | Window Closed / Lapsed |