Patent US2483407A successfully refreshed from Google Patents.
US2483407A
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Focusing arrangement for electron discharge devices of electron velocity modulation tpe
Assignee: International Standard Electric Corp
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Filing: 1946-11-09
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Granted: 1949-10-04
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Expires: 1966-11-09
Abstract
No abstract record available.
Inventors
- 👤 Fremlin John Heaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:42
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/06; H01J25/08; H01J23/00; H01J23/02; H01J23/10; H01J25/10; H01J29/00; H01J29/46; H01J29/58; H01J29/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-03 | 1953-04-04 | 1953-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-03 | 1957-04-04 | 1957-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-03 | 1961-04-04 | 1961-10-04 | $7700.00 | Window Closed / Lapsed |