Patent US2498981A successfully refreshed from Google Patents.
US2789461A
Expired / Lapsed
US
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Inverted microscopes for incident illumination
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1953-03-10
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Granted: 1957-04-23
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Expires: 1973-03-10
Abstract
No abstract record available.
Inventors
- 👤 Leitz Ludwig
- 👤 Klemann Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:43
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/0004; G02B21/0088
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |