Patent US2681995A successfully refreshed from Google Patents.
US2681995A
Expired / Lapsed
US
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Electron discharge device and circuits
Assignee: Zenith Electronics LLC
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Filing: 1949-11-26
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Granted: 1954-06-22
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Expires: 1969-11-26
Abstract
No abstract record available.
Inventors
- 👤 Adler Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:24
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/10; H03K4/26; H03K4/28; H01; H01J; H01J21/00; H01J21/20; H01J2893/00; H01J2893/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1201273A
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US1629009A
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US2037202A
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US2228276A
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US2242351A
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CH214025A
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US2288363A
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US2377456A
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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) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |