US2998052A
Expired / Lapsed
US
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Apparatus for applying leaves of electron emissive material to metallic cathode bases
Assignee: GTE Sylvania Inc
•
Filing: 1958-06-20
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Granted: 1961-08-29
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Expires: 1978-06-20
Abstract
No abstract record available.
Inventors
- 👤 Roeber Henry William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:15
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/06; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1033; Y10T156/12; Y10T156/1317; Y10T156/1322; Y10T156/1339; Y10T156/17; Y10T156/1702; Y10T156/1744; Y10T156/1768; Y10T156/1771; Y10T156/1773
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1559972A
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US1917991A
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GB321437A
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US2201706A
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US2236552A
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US2660547A
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US2788834A
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US2781078A
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US2731654A
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US2786444A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |