US2658959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency radio-frequency power amplifier
Assignee: AT&T Inc
•
Filing: 1949-11-02
•
Granted: 1953-11-10
•
Expires: 1969-11-02
Abstract
No abstract record available.
Inventors
- 👤 William H Doherty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:38
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/04; H03F1/06; H03F1/07; H03C; H03C1/00; H03C1/50
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2435547A
Cited
US2269518A
Cited
US2282714A
Cited
US2282706A
Cited
US2238236A
Cited
US2248132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |