US2531455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directive antenna structure
Assignee: Unisys Corp
•
Filing: 1942-12-07
•
Granted: 1950-11-28
•
Expires: 1962-12-07
Abstract
No abstract record available.
Inventors
- 👤 Wilmer L Barrow
- 👤 Walter W Mieher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:27
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/12; H01Q3/16; H01Q13/00; H01Q13/20; H01Q13/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1931980A
Cited
GB450484A
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US2083242A
Cited
US2206923A
Cited
US2115789A
Cited
US2173897A
Cited
US2220840A
Cited
FR841036A
Cited
US2255042A
Cited
US2342721A
Cited
US2370053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |