Patent US4514058A successfully refreshed from Google Patents.
US2233779A
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Electron discharge device
Assignee: Telefunken AG
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Filing: 1936-11-27
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Granted: 1941-03-04
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Expires: 1956-11-27
Abstract
No abstract record available.
Inventors
- 👤 Fritz Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:55
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/64; H03; H03B; H03B9/00; H03B9/01; H03B9/10; H03C; H03C5/00; H03C5/02; H03C5/04
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) | 1944-03-03 | 1944-09-02 | 1945-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-03-03 | 1948-09-02 | 1949-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-03-03 | 1952-09-02 | 1953-03-04 | $7700.00 | Window Closed / Lapsed |