Patent US2202500A successfully refreshed from Google Patents.
US2202500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tube device
Assignee: Alcatel Lucent Deutschland AG
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Filing: 1939-05-14
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Granted: 1940-05-28
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Expires: 1959-05-14
Abstract
No abstract record available.
Inventors
- 👤 Lopp Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:24
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/32; H01J5/40; H01J2893/00; H01J2893/0033; H01J2893/0034; H01J2893/0035; Y; Y10; Y10S; Y10S439/00; Y10S439/931
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) | 1943-05-28 | 1943-11-27 | 1944-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-28 | 1947-11-27 | 1948-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-28 | 1951-11-27 | 1952-05-28 | $7700.00 | Window Closed / Lapsed |