US2428389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data transmission system
Assignee: AT&T Inc
•
Filing: 1942-12-21
•
Granted: 1947-10-07
•
Expires: 1962-12-21
Abstract
No abstract record available.
Inventors
- 👤 Fred J Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:36
CPC Classifications
G; G08; G08C; G08C19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1116407A
Cited
US1245417A
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US1232499A
Cited
DE464544C
Cited
US1889597A
Cited
US2117580A
Cited
US2081684A
Cited
US2039405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |