Patent US3270281A successfully refreshed from Google Patents.
Patent US2730639A successfully refreshed from Google Patents.
US2730639A
Expired / Lapsed
US
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Target structures such as are utilised in television transmission tubes
Assignee: EMI Ltd
•
Filing: 1950-10-16
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Granted: 1956-01-10
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Expires: 1970-10-16
Abstract
No abstract record available.
Inventors
- 👤 Johnson Charles Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:15
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2193101A
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US2171213A
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US2189985A
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US2189986A
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US2522153A
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US2455513A
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US2507958A
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GB634318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |