US2654885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplex frequency modulation communication system
Assignee: PADEVCO Inc
•
Filing: 1949-12-19
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Granted: 1953-10-06
•
Expires: 1969-12-19
Abstract
No abstract record available.
Inventors
- 👤 Raymond M Wilmotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:34
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H04J; H04J1/00; H04J1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1796030A
Cited
US2298409A
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US2379720A
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GB562915A
Cited
US2463503A
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US2410350A
Cited
US2418119A
Cited
US2463505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |