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US2669706A
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Assignee: AT&T Inc
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Filing: 1950-05-09
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Granted: 1954-02-16
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Expires: 1970-05-09
Abstract
No abstract record available.
Inventors
- 👤 Gray Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:49
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/04; H04L7/041; H04L7/042
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1665622A
Cited
US2110015A
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US1943475A
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US2396211A
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US2441145A
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US2497936A
Cited
US2552174A
Cited
US2534369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |