US3488445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Orthogonal frequency multiplex data transmission system
Assignee: AT&T Inc
•
Filing: 1966-11-14
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Granted: 1970-01-06
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Robert W Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:33
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2383; H04L; H04L27/00; H04L27/26; H04L27/2601; H04N21/40; H04N21/43; H04N21/438; H04N21/4382
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3163718A
Cited
US3349182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |