US3422227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual code differential encoding scheme for video signals
Assignee: AT&T Inc
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Filing: 1965-09-30
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Granted: 1969-01-14
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Expires: 1985-09-30
Abstract
No abstract record available.
Inventors
- 👤 Earl F Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:43
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/40; H04N21/43; H04N21/434; H03; H03M; H03M3/00; H03M3/04; H04N19/00; H04N19/10; H04N19/102; H04N19/124; H04N19/50; H04N21/20; H04N21/23; H04N21/236
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) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |