US3452330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asynchronous data transmission system with error detection and retransmission
Assignee: AT&T Inc
•
Filing: 1967-07-25
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Granted: 1969-06-24
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Expires: 1987-07-25
Abstract
No abstract record available.
Inventors
- 👤 John R Avery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/18; H04L1/1867; H04L1/1887; H04L1/1829; H04L1/188
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2970189A
Cited
US3005871A
Cited
US3223974A
Cited
US3312937A
Cited
US3324460A
Cited
US3327288A
Cited
US3359543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |