US2649539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave carrier telephone system
Assignee: AT&T Inc
•
Filing: 1948-02-21
•
Granted: 1953-08-18
•
Expires: 1968-02-21
Abstract
No abstract record available.
Inventors
- 👤 Sloan D Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:52
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/10; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2061699A
Cited
US2129332A
Cited
US2152329A
Cited
US2234244A
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US2193102A
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US2270899A
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US2206896A
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US2272839A
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US2311435A
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US2461005A
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US2461646A
Cited
GB557563A
Cited
US2467299A
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US2446024A
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US2479701A
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US2448055A
Cited
US2401759A
Cited
US2475127A
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US2427215A
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US2475474A
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US2607004A
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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) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |