Patent US2940020A successfully refreshed from Google Patents.
US2940020A
Expired / Lapsed
US
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Focusing magnet for long electron beams
Assignee: International Standard Electric Corp
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Filing: 1956-02-16
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Granted: 1960-06-07
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Expires: 1976-02-16
Abstract
No abstract record available.
Inventors
- 👤 Muller Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:19
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/06; H01J23/065; H01J23/08; H01J23/083; H01J23/087; H01J23/0876; H01J23/16; H01J23/24; H01J23/26; H01J23/30; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H01P; H01P5/00; H01P5/08; H01Q; H01Q11/00; H01Q11/02; H01Q11/08; H03; H03C; H03C3/00; H03C3/30; H04; H04M; H04M19/00; H04M19/02
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |