Patent US2457948A successfully refreshed from Google Patents.
US2457948A
Expired / Lapsed
US
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Electron discharge device
Assignee: Individual
•
Filing: 1945-02-16
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Granted: 1949-01-04
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Expires: 1965-02-16
Abstract
No abstract record available.
Inventors
- 👤 Albert G Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:09
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J13/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2220077A
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US887642A
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US1976391A
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US2113392A
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US2117246A
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US2071057A
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US2235504A
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US2314691A
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US2263171A
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US2322754A
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US2369767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |