US2928943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic microscope for top illumination of surfaces
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1958-09-05
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Granted: 1960-03-15
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Expires: 1978-09-05
Abstract
No abstract record available.
Inventors
- 👤 Bartz Gunter Erwin
- 👤 Bill Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:32
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/26; H01J37/285; H01J37/02; H01J37/04; H01J37/10; H01J37/20
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) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |