US2656481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun centering device for cathode-ray tubes
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1950-12-13
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Granted: 1953-10-20
•
Expires: 1970-12-13
Abstract
No abstract record available.
Inventors
- 👤 Herndon W Leighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:49
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2171766A
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US2139678A
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US2268194A
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US2289972A
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US2562243A
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US2562242A
Cited
US2562236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |