US2593724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microscope with reflecting objective
Assignee: Optische Industrie de Oude Delft NV
•
Filing: 1945-12-19
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Granted: 1952-04-22
•
Expires: 1965-12-19
Abstract
No abstract record available.
Inventors
- 👤 Bouwers Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:18
CPC Classifications
G; G02; G02B; G02B21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US426869A
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GB149636A
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US1650646A
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US1853674A
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US1972019A
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US1967214A
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US2218270A
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US2170979A
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US2141884A
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US2156911A
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GB548750A
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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) | 1955-04-22 | 1955-10-22 | 1956-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-22 | 1959-10-22 | 1960-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-22 | 1963-10-22 | 1964-04-22 | $7700.00 | Window Closed / Lapsed |