Patent US2233276A successfully refreshed from Google Patents.
US2233276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary electron emissive electrode
Assignee: RCA Corp
•
Filing: 1938-03-25
•
Granted: 1941-02-25
•
Expires: 1958-03-25
Abstract
No abstract record available.
Inventors
- 👤 Vladimir K Zworykin
- 👤 Humboldt W Leverenz
- 👤 John E Ruedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:28
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12; H01J9/125; H01J1/00; H01J1/02; H01J1/32; H01J2201/00; H01J2201/32
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) | 1944-02-25 | 1944-08-26 | 1945-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-25 | 1948-08-26 | 1949-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-25 | 1952-08-26 | 1953-02-25 | $7700.00 | Window Closed / Lapsed |