US2194547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge tube
Assignee: RCA Corp
•
Filing: 1937-08-24
•
Granted: 1940-03-26
•
Expires: 1957-08-24
Abstract
No abstract record available.
Inventors
- 👤 Donald G Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:06
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/02; H01J31/04; H01J21/00; H01J21/02; H01J21/06; H01J21/10; H01J21/14; H01J2893/00; H01J2893/0029
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) | 1943-03-26 | 1943-09-25 | 1944-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-26 | 1947-09-25 | 1948-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-26 | 1951-09-25 | 1952-03-26 | $7700.00 | Window Closed / Lapsed |