US2513338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directive antenna system
Assignee: Unisys Corp
•
Filing: 1943-11-01
•
Granted: 1950-07-04
•
Expires: 1963-11-01
Abstract
No abstract record available.
Inventors
- 👤 George B Litchford
- 👤 Day William Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:45
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1235275A
Cited
FR706446A
Cited
FR802756A
Cited
US2217321A
Cited
US2155821A
Cited
US2279031A
Cited
US2283897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-03 | 1954-01-02 | 1954-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-03 | 1958-01-02 | 1958-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-03 | 1962-01-02 | 1962-07-04 | $7700.00 | Window Closed / Lapsed |