Patent US2804548A successfully refreshed from Google Patents.
US2804548A
Expired / Lapsed
US
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Device for adjusting the refractive power of electron lenses operating with permanent magnet excitation
Assignee: Siemens and Halske AG
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Filing: 1952-01-19
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Granted: 1957-08-27
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Expires: 1972-01-19
Abstract
No abstract record available.
Inventors
- 👤 Ruska Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:51
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/10; H01J37/14; H01J37/143; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0015; H01J2893/0018
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2163157A
Cited
US2305761A
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US2369796A
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US2624022A
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US2503173A
Cited
US2533687A
Cited
US2586559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |