US2777018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-coupled amplifier
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1954-10-15
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Granted: 1957-01-08
•
Expires: 1974-10-15
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2158248A
Cited
GB540834A
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US2428039A
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US2668272A
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US2562476A
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US2544340A
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US2547538A
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US2721907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |