US2521696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optimum frequency radio communication system
Assignee: Individual
•
Filing: 1949-01-24
•
Granted: 1950-09-12
•
Expires: 1969-01-24
Abstract
No abstract record available.
Inventors
- 👤 Armond James K De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:42
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1794393A
Cited
US1913495A
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US2125977A
Cited
US2280822A
Cited
US2260160A
Cited
US2326290A
Cited
US2363583A
Cited
US2425614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |