US2673930A
Expired / Lapsed
US
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Ultrahigh-frequency crystal device of the asymmetrical conductivity type
Assignee: Compagnie des Freins et Signaux Westinghouse SA
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Filing: 1949-08-11
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Granted: 1954-03-30
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Expires: 1969-08-11
Abstract
No abstract record available.
Inventors
- 👤 Matare Herbert Francois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:23
CPC Classifications
H; H10; H10D; H10D99/00; H10D64/00; H10D64/20; H10D64/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2378944A
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US2460109A
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US2402839A
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US2432116A
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US2438521A
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US2501093A
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US2563613A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-29 | 1957-09-28 | 1958-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-29 | 1961-09-28 | 1962-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-29 | 1965-09-28 | 1966-03-30 | $7700.00 | Window Closed / Lapsed |