Patent US2488948A successfully refreshed from Google Patents.
US2488948A
Expired / Lapsed
US
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Repeatered transmission system, including multifilament amplifiers
Assignee: AT&T Inc
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Filing: 1947-11-28
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Granted: 1949-11-22
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Expires: 1967-11-28
Abstract
No abstract record available.
Inventors
- 👤 Edmund A Veazie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:55
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/135; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/544; H04; H04B; H04B17/00; H04B17/40; H04B3/00; H04B3/02; H04B3/44; H04M; H04M3/00; H04M3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190812398A
Cited
US1654513A
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US1833968A
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US1699011A
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US1862393A
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US1940181A
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US2020875A
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US2020318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |