US2777020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct coupled high fidelity amplifier
Assignee: Individual
•
Filing: 1951-06-22
•
Granted: 1957-01-08
•
Expires: 1971-06-22
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Dobosy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:03
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/42; H03F3/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2310342A
Cited
US2438960A
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US2431973A
Cited
US2488567A
Cited
US2549833A
Cited
US2631198A
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 |