US3551598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal-evaluating logic with circulating memory for time-sharing telecommunication system
Assignee: Italtel SpA
•
Filing: 1967-10-18
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Granted: 1970-12-29
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Expires: 1987-10-18
Abstract
No abstract record available.
Inventors
- 👤 Giorgio De Varda
- 👤 Saverio Martinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:13
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/22; H04M3/36; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3171895A
Cited
US3302184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-28 | 1974-06-29 | 1974-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-28 | 1978-06-29 | 1978-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-28 | 1982-06-29 | 1982-12-29 | $7700.00 | Window Closed / Lapsed |