US2492989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directive ultra high frequency antenna
Assignee: Farnsworth Research Corp
•
Filing: 1946-02-09
•
Granted: 1950-01-03
•
Expires: 1966-02-09
Abstract
No abstract record available.
Inventors
- 👤 William S Halstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:29
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/28; H01Q19/30; H01Q1/00; H01Q1/08; H01Q1/10; H01Q3/00; H01Q3/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |