US2680208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: GTE Sylvania Inc
•
Filing: 1949-02-01
•
Granted: 1954-06-01
•
Expires: 1969-02-01
Abstract
No abstract record available.
Inventors
- 👤 Forrest E Gehrke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:08
CPC Classifications
H; H01; H01J; H01J19/00; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/0022; H01J2893/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1128280A
Cited
US1630443A
Cited
US1688991A
Cited
GB310903A
Cited
US1958349A
Cited
GB428478A
Cited
GB550435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |