Patent US2713808A successfully refreshed from Google Patents.
US2713808A
Expired / Lapsed
US
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Microscope objective
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1953-05-13
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Granted: 1955-07-26
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Expires: 1973-05-13
Abstract
No abstract record available.
Inventors
- 👤 Klein Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:03
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1578259A
Cited
US1761441A
Cited
US1910115A
Cited
US2050024A
Cited
US2206255A
Cited
US2644362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-25 | 1959-01-24 | 1959-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-25 | 1963-01-24 | 1963-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-25 | 1967-01-24 | 1967-07-26 | $7700.00 | Window Closed / Lapsed |