US2684999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized direct current amplifier
Assignee: RCA Corp
•
Filing: 1949-04-28
•
Granted: 1954-07-27
•
Expires: 1969-04-28
Abstract
No abstract record available.
Inventors
- 👤 Edwin A Goldberg
- 👤 Lehmann Jules
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:19
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/38; H03F3/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2190743A
Cited
US2297543A
Cited
US2485665A
Cited
US2455711A
Cited
US2536617A
Cited
US2459177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |