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Patent US2874274A successfully refreshed from Google Patents.
US2874274A
Expired / Lapsed
US
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Automatic tuning system
Assignee: TDK Micronas GmbH
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Filing: 1955-04-04
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Granted: 1959-02-17
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Expires: 1975-04-04
Abstract
No abstract record available.
Inventors
- 👤 Robert T Adams
- 👤 Richard K Van Vechten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:00
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2449174A
Cited
US2358454A
Cited
US2376667A
Cited
GB582181A
Cited
US2497202A
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US2519043A
Cited
US2617084A
Cited
US2742618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |