US2476971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge apparatus of the velocity modulation type
Assignee: International Standard Electric Corp
•
Filing: 1943-02-19
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Granted: 1949-07-26
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Expires: 1963-02-19
Abstract
No abstract record available.
Inventors
- 👤 Fremlin John Heaver
- 👤 Foulkes Christopher Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:28
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J25/16; H01J25/06; H01J25/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1661830A
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US1684947A
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US1879544A
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US2128236A
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US2063342A
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US2163589A
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US2202380A
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US2190511A
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US2298949A
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US2289984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |