Patent FR1117703A successfully refreshed from Google Patents.
US2199438A
Expired / Lapsed
US
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Electron discharge device
Assignee: EMI Ltd
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Filing: 1937-01-15
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Granted: 1940-05-07
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Expires: 1957-01-15
Abstract
No abstract record available.
Inventors
- 👤 Lubszynski Hans Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:31
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/30; H01J31/32; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J31/42; H01J40/00; H01J40/02; H01J40/04; H01J40/06
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) | 1943-05-07 | 1943-11-06 | 1944-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-07 | 1947-11-06 | 1948-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-07 | 1951-11-06 | 1952-05-07 | $7700.00 | Window Closed / Lapsed |