US2948868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency sensitive electromagnetic wave device
Assignee: AT&T Inc
•
Filing: 1955-11-14
•
Granted: 1960-08-09
•
Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Marvin L Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:32
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/22; H01P1/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2532157A
Cited
US2555131A
Cited
US2745069A
Cited
GB721309A
Cited
US2743322A
Cited
US2802184A
Cited
US2700147A
Cited
US2762871A
Cited
US2806972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-09 | 1964-02-08 | 1964-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-09 | 1968-02-08 | 1968-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-09 | 1972-02-08 | 1972-08-09 | $7700.00 | Window Closed / Lapsed |