Patent US2707759A successfully refreshed from Google Patents.
US2707759A
Expired / Lapsed
US
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Electronic amplifier
Assignee: AT&T Inc
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Filing: 1948-12-10
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Granted: 1955-05-03
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Expires: 1968-12-10
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:25
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H01J23/00; H01J23/02; H01J23/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2064469A
Cited
US2233126A
Cited
US2300052A
Cited
US2511407A
Cited
US2578434A
Cited
US2600509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |