Patent US2658189A successfully refreshed from Google Patents.
US2658189A
Expired / Lapsed
US
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Signaling system based on orthogonal functions
Assignee: AT&T Inc
•
Filing: 1948-01-09
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Granted: 1953-11-03
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Expires: 1968-01-09
Abstract
No abstract record available.
Inventors
- 👤 Clarence A Lovell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
H; H04; H04L; H04L23/00; H04L23/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1661962A
Cited
US1711137A
Cited
GB375349A
Cited
US2205330A
Cited
US2251973A
Cited
US2176742A
Cited
US2275930A
Cited
US2206538A
Cited
US2319339A
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US2325829A
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US2424585A
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US2324797A
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US2332912A
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US2413440A
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US2363671A
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US2434898A
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US2369662A
Cited
US2395467A
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US2400574A
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US2450352A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |