US2813227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick heating cathode for electron discharge device
Assignee: RCA Corp
•
Filing: 1951-10-19
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Granted: 1957-11-12
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Expires: 1971-10-19
Abstract
No abstract record available.
Inventors
- 👤 Jr Arthur P Sweet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1374647A
Cited
GB214036A
Cited
US1787300A
Cited
US1815483A
Cited
US1822360A
Cited
US1943523A
Cited
US2522259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-11 | 1961-05-13 | 1961-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-11 | 1965-05-13 | 1965-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-11 | 1969-05-13 | 1969-11-12 | $7700.00 | Window Closed / Lapsed |