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US2123178A
Expired / Lapsed
US
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Amplifier
Assignee: AT&T Inc
•
Filing: 1937-06-22
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Granted: 1938-07-12
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Expires: 1957-06-22
Abstract
No abstract record available.
Inventors
- 👤 Hendrik W Bode
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:32
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-07-11 | 1942-01-10 | 1942-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-07-11 | 1946-01-10 | 1946-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-07-11 | 1950-01-10 | 1950-07-12 | $7700.00 | Window Closed / Lapsed |