Patent US2828362A successfully refreshed from Google Patents.
US2828362A
Expired / Lapsed
US
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Digit data transmission system
Assignee: AT&T Inc
•
Filing: 1956-01-24
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Granted: 1958-03-25
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Expires: 1976-01-24
Abstract
No abstract record available.
Inventors
- 👤 George P Darwin
- 👤 William A Malthaner
- 👤 John E Schwenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:21
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1754240A
Cited
US2501063A
Cited
US2703361A
Cited
US2667533A
Cited
US2677011A
Cited
US2770797A
Cited
US2702380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |