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US2954466A
Expired / Lapsed
US
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Electron discharge apparatus
Assignee: Individual
•
Filing: 1956-07-09
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Granted: 1960-09-27
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Expires: 1976-07-09
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:06
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/02; H03K3/00; H03K3/02; H03K3/04; H03K4/06; H03K4/08; H03K4/10; H03K4/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2299252A
Cited
US2456754A
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US2438586A
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US2567247A
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US2602889A
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US2487603A
Cited
US2519030A
Cited
US2871378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |