US2604552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multigrid amplifier with constant ratio of cathode current to anode current
Assignee: EMI Ltd
•
Filing: 1947-04-30
•
Granted: 1952-07-22
•
Expires: 1967-04-30
Abstract
No abstract record available.
Inventors
- 👤 White Eric Lawrence Casling
- 👤 Elbourn Roland William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:49
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2085444A
Cited
US2169096A
Cited
US2198464A
Cited
US2270012A
Cited
US2174234A
Cited
GB508697A
Cited
US2227604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |