US2661441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency amplifier
Assignee: AT&T Inc
•
Filing: 1947-12-31
•
Granted: 1953-12-01
•
Expires: 1967-12-31
Abstract
No abstract record available.
Inventors
- 👤 George E Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:56
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J25/00; H01J25/34; H01J25/36; H01J25/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1979668A
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US1957538A
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US2122538A
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US2153728A
Cited
GB508354A
Cited
US2304540A
Cited
US2300052A
Cited
US2367295A
Cited
US2413608A
Cited
US2575383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |