US2490731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam control apparatus
Assignee: RCA Corp
•
Filing: 1947-02-19
•
Granted: 1949-12-06
•
Expires: 1967-02-19
Abstract
No abstract record available.
Inventors
- 👤 Elmer D Goodale
- 👤 Otto H Schade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:39
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/34; H01J31/36; H01J29/00; H01J29/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172733A
Cited
US2047159A
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US2217409A
Cited
US2234998A
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US2314409A
Cited
US2362034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |