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US2993993A
Expired / Lapsed
US
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Diaphragm for limiting the field of view of three-stage electron microscopes
Assignee: Tesla AS
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Filing: 1959-06-17
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Granted: 1961-07-25
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Expires: 1979-06-17
Abstract
No abstract record available.
Inventors
- 👤 Delong Armin
- 👤 Drahos Vladimir
- 👤 Specialny Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:30
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/02; H01J37/04; H01J37/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1386630A
Cited
US2851610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |