US2651971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Instrument for producing colors by means of polarization
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1950-07-18
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Granted: 1953-09-15
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Expires: 1970-07-18
Abstract
No abstract record available.
Inventors
- 👤 Rosch Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:01
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-14 | 1957-03-16 | 1957-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-14 | 1961-03-16 | 1961-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-14 | 1965-03-16 | 1965-09-15 | $7700.00 | Window Closed / Lapsed |