US2160890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating device for projection apparatus
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1938-02-05
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Granted: 1939-06-06
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Expires: 1958-02-05
Abstract
No abstract record available.
Inventors
- 👤 Mulch Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:10
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/16
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) | 1942-06-05 | 1942-12-05 | 1943-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-06-05 | 1946-12-05 | 1947-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-06-05 | 1950-12-05 | 1951-06-06 | $7700.00 | Window Closed / Lapsed |