Patent US2987644A successfully refreshed from Google Patents.
US2987644A
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Radio frequency impedance matching section
Assignee: TDK Micronas GmbH
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Filing: 1956-10-26
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Granted: 1961-06-06
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Expires: 1976-10-26
Abstract
No abstract record available.
Inventors
- 👤 Charles E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:53
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/36; H01J23/40; H01J23/42; H01J23/02; H01J23/06; H01J23/065; H01J23/08; H01J23/083; H01J23/087; H01J23/0876; H01J23/16; H01J23/24; H01J23/26; H01J23/30; H01J23/48; H01J23/50; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H01P; H01P5/00; H01P5/08; H01Q; H01Q11/00; H01Q11/02; H01Q11/08; H03; H03C; H03C3/00; H03C3/30; H03H; H03H2/00; H03H2/005; H03H2/006; H04; H04M; H04M19/00; H04M19/02; H04M5/00; H04M5/04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1937652A
Cited
US1932448A
Cited
US2292496A
Cited
US2615141A
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US2637775A
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US2707759A
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GB668513A
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DE840264C
Cited
US2765421A
Cited
US2803777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |