Patent US4492575A successfully refreshed from Google Patents.
Patent US2575448A successfully refreshed from Google Patents.
US2575448A
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US
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Electron discharge device
Assignee: GTE Sylvania Inc
•
Filing: 1945-08-22
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Granted: 1951-11-20
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Expires: 1965-08-22
Abstract
No abstract record available.
Inventors
- 👤 Haas Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:47
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36; H01J5/00; H01J5/20; H01J5/22; H01J5/26; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0041; H01J2893/0043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2089795A
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US2297492A
Cited
US2386820A
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US2317889A
Cited
US2343849A
Cited
US2488302A
Cited
US2494870A
Cited
US2462205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-19 | 1955-05-21 | 1955-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-19 | 1959-05-21 | 1959-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-19 | 1963-05-21 | 1963-11-20 | $7700.00 | Window Closed / Lapsed |