US2927967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative impedance repeater
Assignee: AT&T Inc
•
Filing: 1957-10-14
•
Granted: 1960-03-08
•
Expires: 1977-10-14
Abstract
No abstract record available.
Inventors
- 👤 James O Edson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:45
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/20; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2221452A
Cited
US2429613A
Cited
US2659773A
Cited
US2663766A
Cited
US2802118A
Cited
US2809303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-08 | 1963-09-07 | 1964-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-08 | 1967-09-07 | 1968-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-08 | 1971-09-07 | 1972-03-08 | $7700.00 | Window Closed / Lapsed |