US2956276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diversity system
Assignee: AT&T Inc
•
Filing: 1957-09-16
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Granted: 1960-10-11
•
Expires: 1977-09-16
Abstract
No abstract record available.
Inventors
- 👤 Harald T Friis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/007; H01P; H01P1/00; H01P1/32; H01P1/38; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |