US2636125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective electromagnetic wave system
Assignee: AT&T Inc
•
Filing: 1948-04-10
•
Granted: 1953-04-21
•
Expires: 1968-04-10
Abstract
No abstract record available.
Inventors
- 👤 George C Southworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:26
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01Q; H01Q15/00; H01Q15/0006; H01Q15/0013; H01Q15/0033; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016; Y10T29/496
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1717360A
Cited
US2043347A
Cited
US2129712A
Cited
GB439608A
Cited
US2216326A
Cited
US2325765A
Cited
US2314800A
Cited
US2432093A
Cited
US2423648A
Cited
US2415352A
Cited
US2442951A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |