US2554087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-frequency oscillator with a back-coupled electron tube
Assignee: Hartford National Bank and Trust Co
•
Filing: 1948-01-23
•
Granted: 1951-05-22
•
Expires: 1968-01-23
Abstract
No abstract record available.
Inventors
- 👤 Breimer Sytse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:01
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/10; H05; H05B; H05B6/00; H05B6/02; H05B6/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2319320A
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US2381057A
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US2420857A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |