Patent US89758A successfully refreshed from Google Patents.
Patent US2197652A successfully refreshed from Google Patents.
US2197652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube
Assignee: General Electric Co
•
Filing: 1938-03-30
•
Granted: 1940-04-16
•
Expires: 1958-03-30
Abstract
No abstract record available.
Inventors
- 👤 Statz Willi
- 👤 Malsch Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:54
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J21/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1943-04-16 | 1943-10-16 | 1944-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-16 | 1947-10-16 | 1948-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-16 | 1951-10-16 | 1952-04-16 | $7700.00 | Window Closed / Lapsed |