Patent US3021384A successfully refreshed from Google Patents.
US3021384A
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Time divisdion multiplexing of television and telephone messages
Assignee: AT&T Inc
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Filing: 1959-12-28
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Granted: 1962-02-13
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Expires: 1979-12-28
Abstract
No abstract record available.
Inventors
- 👤 Earl F Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:15
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/236; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/047; H04J3/16; H04J3/1605; H04N21/40; H04N21/43; H04N21/434; H04N7/00; H04N7/14; H04N7/141; H04N7/24; H04N7/52; H04N7/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |