US2958799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic focussing device
Assignee: Centre National de la Recherche Scientifique
•
Filing: 1955-05-31
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Granted: 1960-11-01
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Expires: 1975-05-31
Abstract
No abstract record available.
Inventors
- 👤 Mihailovic Zivko
- 👤 Rimsky Alexandre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:29
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/14; H01J35/147
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US733756A
Cited
US2113422A
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US2119679A
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US2206558A
Cited
US2617046A
Cited
US2683223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |