Patent US2578429A successfully refreshed from Google Patents.
US2578429A
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Ultrahigh-frequency tuning apparatus
Assignee: General Radio Co
•
Filing: 1945-12-19
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Granted: 1951-12-11
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Expires: 1965-12-19
Abstract
No abstract record available.
Inventors
- 👤 Karplus Eduard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:27
CPC Classifications
H; H03; H03H; H03H5/00; H03H5/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1641687A
Cited
US2086331A
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US2120518A
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US2100412A
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GB458710A
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US2181871A
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US2126868A
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US2330822A
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US2301163A
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US2367681A
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US2453489A
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US2409073A
Cited
US2483893A
Cited
US2448554A
Cited
US2482393A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-10 | 1955-06-11 | 1955-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-10 | 1959-06-11 | 1959-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-10 | 1963-06-11 | 1963-12-11 | $7700.00 | Window Closed / Lapsed |