US1693969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for projecting stars
Assignee: Carl Zeiss AG
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Filing: 1925-12-03
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Granted: 1928-12-04
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Expires: 1945-12-03
Abstract
No abstract record available.
Inventors
- 👤 Villiger Walter
- 👤 Bauersfeld Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:31
CPC Classifications
G; G03; G03B; G03B21/00
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) | 1931-12-04 | 1932-06-04 | 1932-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-12-04 | 1936-06-04 | 1936-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-12-04 | 1940-06-04 | 1940-12-04 | $7700.00 | Window Closed / Lapsed |