Patent US3391339A successfully refreshed from Google Patents.
US3391339A
Expired / Lapsed
US
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Phase-locked quadrature modulation transmission system
Assignee: AT&T Inc
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Filing: 1964-11-06
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Granted: 1968-07-02
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Expires: 1984-11-06
Abstract
No abstract record available.
Inventors
- 👤 John F Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B14/00; H04B14/002; H04B14/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2256317A
Cited
US2719189A
Cited
US2965717A
Cited
US3030449A
Cited
US3084328A
Cited
US3134855A
Cited
US3289082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |