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Patent US3430143A successfully refreshed from Google Patents.
US3430143A
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US
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Communications system wherein information is represented by the phase difference between adjacent tones
Assignee: General Dynamics Corp
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Filing: 1965-03-15
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Granted: 1969-02-25
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Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 Watson F Walker
- 👤 Thijs De Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:36
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/227; H04L27/2275; H04L27/2278; H04L27/20; H04L27/2032; H04L27/2035; H04L27/2042; H04L27/205
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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |