Patent US2661398A successfully refreshed from Google Patents.
US2661398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized thermionic amplifier
Assignee: Marconis Wireless Telegraph Co Ltd
•
Filing: 1949-02-28
•
Granted: 1953-12-01
•
Expires: 1969-02-28
Abstract
No abstract record available.
Inventors
- 👤 Cooper Victor James
- 👤 Nixon John Esmonde Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:43
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/42; H03F3/44
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |