US2730639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Target structures such as are utilised in television transmission tubes
Assignee: EMI Ltd
•
Filing: 1950-10-16
•
Granted: 1956-01-10
•
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 09:22
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/43
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2120099A
Cited
US2140994A
Cited
US2193101A
Cited
US2171213A
Cited
US2189985A
Cited
US2189986A
Cited
US2522153A
Cited
US2455513A
Cited
US2507958A
Cited
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 |