US2512682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duplex antenna
Assignee: Farnsworth Research Corp
•
Filing: 1946-05-31
•
Granted: 1950-06-27
•
Expires: 1966-05-31
Abstract
No abstract record available.
Inventors
- 👤 Hans W G Salinger
- 👤 Virgil R Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:17
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1842342A
Cited
US2268664A
Cited
GB501439A
Cited
US2404012A
Cited
GB545880A
Cited
US2268640A
Cited
US2364084A
Cited
US2354332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |