Patent US2809554A successfully refreshed from Google Patents.
US2809554A
Expired / Lapsed
US
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Microscope objective with low magnification for epi-microscopes
Assignee: Carl Zeiss AG
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Filing: 1954-07-16
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Granted: 1957-10-15
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Expires: 1974-07-16
Abstract
No abstract record available.
Inventors
- 👤 Bernhardt Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:36
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1799290A
Cited
US1951636A
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US1985074A
Cited
US2130494A
Cited
US2137079A
Cited
US2694773A
Cited
CH608644A5
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |