Patent US2887573A successfully refreshed from Google Patents.
US2887573A
Expired / Lapsed
US
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Converter with high frequency crystal transistor oscillator
Assignee: Individual
•
Filing: 1956-11-05
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Granted: 1959-05-19
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Expires: 1976-11-05
Abstract
No abstract record available.
Inventors
- 👤 Leo J Hruska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:51
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2570840A
Cited
US2485045A
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US2692337A
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US2742571A
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US2770731A
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US2745963A
Cited
US2774866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |