Patent US2454318A successfully refreshed from Google Patents.
US2454318A
Expired / Lapsed
US
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Method of fabricating electron discharge devices
Assignee: Westinghouse Electric Corp
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Filing: 1943-04-24
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Granted: 1948-11-23
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Expires: 1963-04-24
Abstract
No abstract record available.
Inventors
- 👤 William A Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:04
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04
Claims Analysis
Total Claims: 0
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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) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |