US2564419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time division multiplex system for signals of different band width
Assignee: AT&T Inc
•
Filing: 1947-04-14
•
Granted: 1951-08-14
•
Expires: 1967-04-14
Abstract
No abstract record available.
Inventors
- 👤 Bown Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:28
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/16; H04J3/1605; H04J3/1623; H04J3/1647; H04J3/02; H04J3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1928093A
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US1918252A
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US2036350A
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GB475239A
Cited
US2199634A
Cited
US2277192A
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US2405252A
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US2406165A
Cited
US2495739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |