US3369229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilevel pulse transmission system
Assignee: AT&T Inc
•
Filing: 1964-12-14
•
Granted: 1968-02-13
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Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Dorros Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:39
CPC Classifications
H; H03; H03M; H03M1/00; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4919; H04L5/00; H04L5/02; H04L5/04; H03M1/06; H03M1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2700696A
Cited
US2996578A
Cited
US3126537A
Cited
US3149323A
Cited
US3154777A
Cited
US3302193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |