US2817034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic focussing field arrangements for cathode ray tubes
Assignee: AC Cossor Ltd
•
Filing: 1953-10-08
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Granted: 1957-12-17
•
Expires: 1973-10-08
Abstract
No abstract record available.
Inventors
- 👤 Covill Dennis Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:13
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB530914A
Cited
US2418487A
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US2591820A
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US2533688A
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US2717324A
Cited
US2581657A
Cited
US2568668A
Cited
US2580606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |