US2636948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency amplifier
Assignee: AT&T Inc
•
Filing: 1946-01-11
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Granted: 1953-04-28
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Expires: 1966-01-11
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:02
CPC Classifications
B; B65; B65D; B65D88/00; B65D88/02; C; C21; C21B; C21B13/00; C21B13/0033; H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/30; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H03; H03F; H03F3/00; H03F3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21739E
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US2233126A
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US2122538A
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US2088749A
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US2197123A
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US2368031A
Cited
US2300052A
Cited
US2367295A
Cited
US2429243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |