US2563807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge apparatus circuit
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1949-10-13
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Granted: 1951-08-14
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Expires: 1969-10-13
Abstract
No abstract record available.
Inventors
- 👤 Alfven Hannes
- 👤 Romanus Harald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:31
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H01; H01J; H01J21/00; H01J21/02; H01J21/06; H01J21/10; H01J21/14; H01J31/00; H01J31/02; H01J31/06; H04Q3/00; H04Q3/42; H01J2893/00; H01J2893/0029
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2233779A
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US2205071A
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US2395299A
Cited
US2293567A
Cited
US2372210A
Cited
US2372328A
Cited
US2446228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-13 | 1955-02-12 | 1955-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-13 | 1959-02-12 | 1959-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-13 | 1963-02-12 | 1963-08-14 | $7700.00 | Window Closed / Lapsed |