Patent US2810090A successfully refreshed from Google Patents.
US2810090A
Expired / Lapsed
US
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Cathodes for electron discharge devices
Assignee: AT&T Inc
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Filing: 1953-06-15
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Granted: 1957-10-15
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Expires: 1973-06-15
Abstract
No abstract record available.
Inventors
- 👤 Macnair Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
H; H01; H01J; H01J3/00; H01J3/02; H01J1/00; H01J1/02; H01J1/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |