Patent US2630497A successfully refreshed from Google Patents.
US2630497A
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Frequency modulation multiplex system
Assignee: Individual
•
Filing: 1949-06-01
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Granted: 1953-03-03
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Expires: 1969-06-01
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:05
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/20; H03; H03C; H03C3/00; H03C3/02; H03C3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1861462A
Cited
GB489716A
Cited
US2407308A
Cited
CH250541A
Cited
US2522368A
Cited
US2421727A
Cited
US2583484A
Cited
US2523222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-02 | 1956-09-01 | 1957-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-02 | 1960-09-01 | 1961-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-02 | 1964-09-01 | 1965-03-03 | $7700.00 | Window Closed / Lapsed |