US2660708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency division
Assignee: Individual
•
Filing: 1949-11-09
•
Granted: 1953-11-24
•
Expires: 1969-11-09
Abstract
No abstract record available.
Inventors
- 👤 Theodore H Nakken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:31
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1494908A
Cited
US1745415A
Cited
US2045796A
Cited
US2124191A
Cited
US2315308A
Cited
US2423103A
Cited
US2488584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |