US2321291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band pass amplifier
Assignee: RCA Corp
•
Filing: 1941-10-31
•
Granted: 1943-06-08
•
Expires: 1961-10-31
Abstract
No abstract record available.
Inventors
- 👤 Gustave L Grundmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:19
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/60; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/50; H03H; H03H7/00; H03H7/01; H03H7/0153; H03H7/0161; H03H7/0169; H03H7/0176
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-06-07 | 1946-12-07 | 1947-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-06-07 | 1950-12-07 | 1951-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-06-07 | 1954-12-07 | 1955-06-08 | $7700.00 | Window Closed / Lapsed |