US3471830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error control system
Assignee: AT&T Inc
•
Filing: 1964-04-01
•
Granted: 1969-10-07
•
Expires: 1984-04-01
Abstract
No abstract record available.
Inventors
- 👤 Lorin P Mcrae
- 👤 Robert N Watts
- 👤 William J Wolf Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:53
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0057; H03; H03M; H03M13/00; H03M13/03; H03M13/05; H03M13/09; H03M13/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3156767A
Cited
US3163848A
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US3398400A
Cited
US3234518A
Cited
US3237157A
Cited
US3051784A
Cited
US3273119A
Cited
US3230309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |