US2777905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low distortion amplifier
Assignee: Individual
•
Filing: 1952-08-28
•
Granted: 1957-01-15
•
Expires: 1972-08-28
Abstract
No abstract record available.
Inventors
- 👤 Dunford A Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:08
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1985352A
Cited
US2120823A
Cited
GB453574A
Cited
US2153756A
Cited
GB515158A
Cited
US2386892A
Cited
US2624796A
Cited
US2542160A
Cited
US2581953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-15 | 1960-07-16 | 1961-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-15 | 1964-07-16 | 1965-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-15 | 1968-07-16 | 1969-01-15 | $7700.00 | Window Closed / Lapsed |