Patent US2789240A successfully refreshed from Google Patents.
US2789240A
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US
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Cold cathode electron discharge devices
Assignee: RCA Corp
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Filing: 1952-11-22
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Granted: 1957-04-16
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Expires: 1972-11-22
Abstract
No abstract record available.
Inventors
- 👤 Martin J Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:06
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/16; H01J1/00; H01J1/02; H01J1/34; H01J2201/00; H01J2201/34; H01J2201/342; H01J2201/3421; H01J2201/3426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1775588A
Cited
US1788553A
Cited
US1965849A
Cited
US2092814A
Cited
US2206387A
Cited
US2218340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |