US3477043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic d.c. offset compensation circuit for automatic equalizer
Assignee: AT&T Inc
•
Filing: 1968-01-24
•
Granted: 1969-11-04
•
Expires: 1988-01-24
Abstract
No abstract record available.
Inventors
- 👤 Cecil W Farrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:51
CPC Classifications
H; H03; H03H; H03H21/00; H03H21/0001; H04; H04L; H04L25/00; H04L25/02; H04L25/06; H04L25/061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3315171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |