Patent US3414819A successfully refreshed from Google Patents.
US3414819A
Expired / Lapsed
US
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Digital adaptive equalizer system
Assignee: AT&T Inc
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Filing: 1965-08-27
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Granted: 1968-12-03
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Expires: 1985-08-27
Abstract
No abstract record available.
Inventors
- 👤 Robert W Lucky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:52
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/03031
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3308431A
Cited
US3292110A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-03 | 1972-06-03 | 1972-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-03 | 1976-06-03 | 1976-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-03 | 1980-06-03 | 1980-12-03 | $7700.00 | Window Closed / Lapsed |