US2244358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermionic cathode assembly
Assignee: RCA Corp
•
Filing: 1939-12-30
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Granted: 1941-06-03
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Expires: 1959-12-30
Abstract
No abstract record available.
Inventors
- 👤 Earl R Ewald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:07
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J29/00; H01J29/46; H01J29/48; H01J29/484
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-06-02 | 1944-12-02 | 1945-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-06-02 | 1948-12-02 | 1949-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-06-02 | 1952-12-02 | 1953-06-03 | $7700.00 | Window Closed / Lapsed |