Patent US2594409A successfully refreshed from Google Patents.
US2594409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directive antenna
Assignee: AT&T Inc
•
Filing: 1943-07-27
•
Granted: 1952-04-29
•
Expires: 1963-07-27
Abstract
No abstract record available.
Inventors
- 👤 Carl B H Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:10
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1821386A
Cited
DE694523C
Cited
US2241119A
Cited
US2197123A
Cited
US2244756A
Cited
US2422691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-29 | 1955-10-29 | 1956-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-29 | 1959-10-29 | 1960-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-29 | 1963-10-29 | 1964-04-29 | $7700.00 | Window Closed / Lapsed |