US2454971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation
Assignee: General Electric Co
•
Filing: 1946-05-22
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Granted: 1948-11-30
•
Expires: 1966-05-22
Abstract
No abstract record available.
Inventors
- 👤 Robert V Langmuir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:41
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/30; H03C3/32; H01; H01J; H01J25/00; H01J25/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-30 | 1952-05-31 | 1952-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-30 | 1956-05-31 | 1956-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-30 | 1960-05-31 | 1960-11-30 | $7700.00 | Window Closed / Lapsed |