Patent US2803163A successfully refreshed from Google Patents.
US2803163A
Expired / Lapsed
US
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Illuminating system for picture projectors
Assignee: Zeiss Ikon AG
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Filing: 1953-05-18
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Granted: 1957-08-20
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Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 Ulffers Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:52
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/208
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1342894A
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US1633228A
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US2225485A
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US2186123A
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US2183249A
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US2270517A
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US2238008A
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US2326970A
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US2552185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |