US2749543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional antenna systems
Assignee: Individual
•
Filing: 1951-08-15
•
Granted: 1956-06-05
•
Expires: 1971-08-15
Abstract
No abstract record available.
Inventors
- 👤 Marvin P Middlemark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:29
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1307094A
Cited
US1424365A
Cited
US2283914A
Cited
US2299218A
Cited
US2368286A
Cited
US2617935A
Cited
US2585670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |