Patent EP0147592A1 successfully refreshed from Google Patents.
US2804544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two band long line superheterodyne tuner using two modes of resonance for oscillatorline
Assignee: Individual
•
Filing: 1953-12-11
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Granted: 1957-08-27
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Expires: 1973-12-11
Abstract
No abstract record available.
Inventors
- 👤 Patrick E Lannan
- 👤 Marion L Snedeker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:46
CPC Classifications
H; H03; H03H; H03H5/00; H03H5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2126541A
Cited
US2265833A
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US2292254A
Cited
FR897086A
Cited
US2408896A
Cited
US2505572A
Cited
US2446003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |