US1840448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminating device for microscopes
Assignee: Ernst Leitz Wetzlar GmbH
•
Filing: 1930-01-25
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Granted: 1932-01-12
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Expires: 1950-01-25
Abstract
No abstract record available.
Inventors
- 👤 Heine Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:01
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/06; G02B21/08; G02B21/082; G02B21/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1935-01-11 | 1935-07-13 | 1936-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-01-11 | 1939-07-13 | 1940-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-01-11 | 1943-07-13 | 1944-01-12 | $7700.00 | Window Closed / Lapsed |