Patent US2218702A successfully refreshed from Google Patents.
US2218702A
Expired / Lapsed
US
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Electron device
Assignee: Telefunken AG
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Filing: 1939-12-09
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Granted: 1940-10-22
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Expires: 1959-12-09
Abstract
No abstract record available.
Inventors
- 👤 Diels Kurt
- 👤 Knoll Max
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:42
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/62; H01J29/622; H01J29/624; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/31; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/123; C08G63/137; H01J29/48; H01J29/488
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) | 1943-10-22 | 1944-04-22 | 1944-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-10-22 | 1948-04-22 | 1948-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-10-22 | 1952-04-22 | 1952-10-22 | $7700.00 | Window Closed / Lapsed |