Patent US2155404A successfully refreshed from Google Patents.
US2155404A
Expired / Lapsed
US
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Amplifier circuit
Assignee: Collins Radio Co
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Filing: 1935-12-26
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Granted: 1939-04-25
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Expires: 1955-12-26
Abstract
No abstract record available.
Inventors
- 👤 Craft Liva Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:26
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/14; H03F1/16; H03F1/34; H03F1/36; H03H; H03H5/00; H03H5/006
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) | 1942-04-24 | 1942-10-24 | 1943-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-04-24 | 1946-10-24 | 1947-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-04-24 | 1950-10-24 | 1951-04-25 | $7700.00 | Window Closed / Lapsed |