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US2638564A
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Stabilizing means for cold cathode tube flip-flop circuits
Assignee: Northrop Grumman Corp
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Filing: 1950-08-18
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Granted: 1953-05-12
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Expires: 1970-08-18
Abstract
No abstract record available.
Inventors
- 👤 Charles R Williams
- 👤 Glenn E Hagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:49
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2234690A
Cited
US2478683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |