US2454741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra high frequency electronic tube
Assignee: GTE Sylvania Inc
•
Filing: 1944-05-24
•
Granted: 1948-11-23
•
Expires: 1964-05-24
Abstract
No abstract record available.
Inventors
- 👤 Henry J Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:01
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; H01J5/28; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2106770A
Cited
US2129713A
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US2050576A
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US2075477A
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US2187126A
Cited
US2364732A
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US2296307A
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US2351744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |