Patent US2983219A successfully refreshed from Google Patents.
US2812433A
Expired / Lapsed
US
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Plural band frequency converter with intermediate frequency trapping means
Assignee: US Philips Corp
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Filing: 1953-01-02
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Granted: 1957-11-05
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Stolk Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:58
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/06; H03D7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1757325A
Cited
CH174230A
Cited
US2141756A
Cited
US2215775A
Cited
US2261778A
Cited
US2278030A
Cited
US2516272A
Cited
US2512481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |