Patent US2520190A successfully refreshed from Google Patents.
US2520190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube
Assignee: Philips Laboratories Inc
•
Filing: 1946-10-24
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Granted: 1950-08-29
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Expires: 1966-10-24
Abstract
No abstract record available.
Inventors
- 👤 Mark E Amdursky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:03
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/894; H01J29/892
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2060825A
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GB452148A
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GB487241A
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US2139678A
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US2299047A
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US2295779A
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US2415311A
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GB557771A
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US2440736A
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US2440735A
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US2467462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |