US2581159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable band pass amplifier for television
Assignee: RCA Corp
•
Filing: 1948-05-28
•
Granted: 1952-01-01
•
Expires: 1968-05-28
Abstract
No abstract record available.
Inventors
- 👤 John C Achenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:18
CPC Classifications
H; H03; 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)
US1955130A
Cited
US2153738A
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US2136664A
Cited
GB477048A
Cited
US2207796A
Cited
US2240295A
Cited
US2157170A
Cited
US2270017A
Cited
US2217839A
Cited
US2284131A
Cited
US2252609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |